Krystof's apartment was spacious, comfortable, and in an amazing location. The space was clean and exactly as pictured. He even provided a crib for our daughter without us asking. I didn't get to meet Krystof personally, but his brother and mother were very friendly and provided a lot of information during checkin.
The kitchen is definitely minimally equipped, so check for anything you need before cooking. And just to clarify since I didn't see it explicitly anywhere, the stairs in the pictures do indicate that this is not a ground floor apartment and there is no lift.
Overall, we had a great stay.