Translation of archenemy in German

Then we went to a street where most backpackers would hang out as we wanted to make reservation for a trip that we planned for the next day. There were a lot of travel agents on that street.
Breakfast was unbelievable. It was just delicious. They had all kinds of tropical fruits, great baked bred and croissants and superb jam. Coffee was not too bad either and service excellent.
Dinner was nothing special in this town and the restaurant wasn't either. Most waiters and the owner himself were more interested in Chile's qualifying soccer game than in their guests.