We have just returned from our first trip to Krakow and we loved it! we stayed in the Krakow city appts for 4 nights.The accomodation was well equipped,spacious,clean and in a quiet location, looking out onto a pleasant courtyard at the back.It is within a 5 min walk to the train station and the centre.There is a supermarket next door and close by is the tourist information office and plenty of restaurants.
I would agree with another review that the owners must be aware of your time of arrival as the appts. are locked.
We were made very welcome and would definitely stay here again if we visit Krakow in the future.