We had a lovely trip to Krakow in December '16 with all the family. The apartment is clean and very spacious, ample room for our party of four children and three adults. The hosts were very welcoming and location is excellent for access to both the Old Town and the Jewish Quarter.
The one thing that wasn't mentioned was that there is a gay club on the ground floor of the building for which access is through the same front door off the street. With that said we weren't disturbed in any way but some people might like to be informed prior to booking.
All in all though a nice apartment and great location for exploring the sights of Krakow.