Being the practical mum, I also have to add, clean, lots of private loos and free laundry! And any place that lets a family of 6 stay gets points from me. (In a private room, we didn't bug the single folks!
Also, it's easy to get to and walking distance to lots of stuff. Kazimeirz is interesting, Wawel is a must see (go early to get tickets to the main attractions), as is the town square. There's an awesome Fransican Church that is decorated in the most extraordinary Art Nouveau style - not at all what you expect from the gothic architecture, and I've not seen another church like it in eastern Europe. (I believe it's called St. Francis Basilica - near the main square.) We also enjoyed the day trip to the Wieliska (sp) salt mines, and of course there's Auschwitz.