The currency in Germany is the Euro. One Euro breaks down into 100 cents. As a rule of thumb the exchange rates to the Euro are approximately:
The Euro is the second most common currency in the world after the US dollar, and the same banknotes are used in all the countries in the Euro-zone (each country issues different coins, but these differ only in the picture on the back, and can be used outside their country of issue). Even in the European countries which do not use the Euro as their official currency, it is still very common to find it accepted in larger shops and hotels (sometimes at a suprisingly reasonable rate of exchange). It should not be difficult to exchange into or out of Euros at currency exchanges worldwide.
You should beware of out-of-town airports when using any budget carriers - while airports such as Berlin's Schoenfeld, Templehof and Tegel are all within easy and cheap reach of central Berlin (and each other) by public transport, Dusseldorf has one real airport with good links and one "Ryanair" airport located 20 euros away from the city itself. Check details of the stated airport on this site or on the website for the airport itself.
Also make sure you are making a fair comparison with the costs of train travel before you book. Extra charges such as cost of getting to/from the airport, and the "taxes" added to air fares after you have selected your flight which are often in excess of 20 euros, all raise the end price of air travel. Also, cheap tickets are only really available in advance, meaning that comparisons have to be made against advance purchase prices on the trains.
This is not to write off German railways altogether - compared to railways in Spain and much of Eastern Europe, they are reliable, regular and fast, and the staff are generally extremely polite and helpful, but the reputation they have for being the best railway in Europe is not really deserved. In any case, they are still by far the best way to get around in Germany, and since Germany is right in the centre of Europe, they are pretty key to most international rail travel on the continent. So here are some tips on how to survive, and even save a little money when using them:
The German postal service is a pretty much no-nonsense affair. Stamps are widely available and one type of post box fits all. As at November 2005, costs for a standard letter up to 20g are:
Up to date prices, and full details are available from Deutsche Poste
Germany doesn't have a great reputation worldwide for the quality or uniqueness of its food. The only even remotely famous foods are sausages (or wurste), schntizel, and sauerkraut. While all of these are delicious and widely available in Germany, they do very little justice to the quality and variety of food available here. In Germany as in the UK, the immigrant population has brought with it a wide range of restuarants and takeout food from diverse ethnic origins. Whether you want Italian, Turkish, North-African or East Asian foods, you will find it somewhere in Germany. And if that's not enough I guess you can always go to McDonalds.
Germany is the home of the discount supermarket, and there are certainly branches of Lidl and Aldi on every street corner in many cities. These are perfect for picking up supplies if you are cooking in a hostel, or have a kitchen to prepare lunches for a week, but if you just looking for lunch for one which can be prepared on the road you might find you are better off in an ordinary supermarket or delicatessen. Take advantage of your location to try some of the more interesting foods eaten in Germany. Even the cheaper stores are likely to have tubs of Herring, pickled and served in cream sauce, and jars of pickles. Also try a range of different sausages. Whilst some of the more revered and famous types taste little better than the cheapest hot-dog weiners, there is a huge variety and at least one for every taste.
Beware of deposits on bottles and drink containers of all kinds in Germany. The word for depost is pfand, and the amount you will have to pay is normally listed next to the price of the product on the shelf. Ideally you should just use the contents and take the container back for recycling like a good citizen - you will then get your deposit back and everybody will be happy. If you are leaving the country however, or just can't be bothered to deal with an added transaction in a strange language, you can avoid paying deposits for most things by buying them in tetra-pak style cardboard cartons.
(See also the article on Drink in the Food and Drink section).
Bars in Germany are typically quite small, often with only one or two members of staff. Most often they will be divided into two, with the area close to the bar filled with bar stools and standing customers. It is normal to order your drinks directly from the bar if you are in this area. The remainder of the bar will filled with normal tables, where table service is provided. If the service is slow, or you would like to look at the options at the bar, it is not considered particularly rude to order drinks from the bar if you are seated at a table. Drinks mats are commonly used to keep tabs on how much you owe, with different markings meaning different drinks, so take care not to doodle on them and increase your bill. Even if you just pop in for one drink it is usually easiest to just settle your bill when you leave.
On a weeknight it may be necessary to hunt around a little before you find a bar which is open particularly late, otherwise closing will quite likely be by midnight. You will have no such problems on a Friday or Saturday night.