We stayed at Sarah and Frantisek 's apartment around Christmas time. It is a beautiful place in a very good location - 3 min walk to the Wenceslas square (with all vendors, little shops and restaurants, food market if you want to cook at home and subway for easy transportation to remote locations if you are tired of walking). Although, everything - all tourist sites - is really in a walking distance. We were greeted by Frank - he was very welcoming and answered all questions and explained all details.
The apartment is equipped with 2 beds for 2 people each, we needed another sleeping place and Frank provided us with the air mattress for our kid. The place is spacious and stylish. We had all we needed - espresso maker, tea kettle, pots, dishes, washer, dryer, hair dryer, etc...
The only thing I would suggest to add - nice sturdy placemats for the table so the guests are not worried about ruining the table with hot mugs. Also, as other guests mentioned before - the water from the shower is splashing far and I had to clean it. Seems like some kind of the design flaw. And if you want to use an elevator - it is very-very small - literally - fits one person OR 2 suitcases. If you hate climbing the stairs - it would be a challenge... In summary, we enjoyed our stay at this apartment a lot and would recommend it to anyone.