This upmarket hostel in an 18th-century hotel scores big with wallet-watching global nomads, especially as reception's open round the clock and there's no lockout or curfew. Rooms are bright and spacious, many with sofas. Make friends in the communal kitchen and on-site lounge-bar, or pedal around the city on one of the hostel's bikes (€10 per day).
From the train station, take bus 51 (direction Hochheim) to 'Alte Oper'.