I was very happy with my stay at Sleep Innn. Whilst these are apartments, I nevertheless found the front desk staff helpful and available. The location is good; the apartments are right next to the train and bus station, as well as a large mall, and a short but pleasant walk to the more central areas. I deliberately chose this for a short break as knew I would be getting the bus to/from the airport and Auschwitz, so wanted something convenient for those trips. Even though not so central, the area is nice with supermarkets, cafes and restaurants in the vicinity. Apartment was a good size and felt well equipped enough for me.
Particularly given the price, I don't really have anything negative to add but if I were nitpicking: the shower drained painfully slowly and it would have been helpful to have a tray/shelf in the shower cubicle, and I can imagine the sofa bed wouldn't suit all guests although I found it OK. Oh and remember it is a (relatively) early check-out here!