Well, that's fine! Anyone who goes on a city trip will already spend enough money anyway. Sightseeing, clubs, renting bikes, ice cream, flea markets...
It's good if you can at least sleep cheaply there. A&O offers the right bed for everyone: in a hostel/youth hostel, in a hotel or in an apartment. Always right in the middle of the action, in Berlin e.g. at the zoo, main station, in Mitte and in Friedrichshain.
The A&O hostels, hotels and apartments are located in the coolest cities in Europe, Hamburg and Dresden are there as well as Vienna and Prague, and the accommodations are well equipped and so cheap that you won't believe it.
A&O hostels and hotels are popular among students because they are simply cheap. So simply save money on your next city trip thanks to an A&O hostel.