Spend 3 nights at Jarda's Gym, and had a good time. Jarda was helpfull with questions as parking places and things to do.
The place was clean, good showers (getting warm takes some minutes) and the 'chill place with couches' was very nice. Airbeds and sleeping bags where in good state. Location was good, walking distance to culture places and party spots, a parking garage next to the entrance and a supermarket around the corner. All by all a good place for (big) groups. (and very cheap)