I totally made the right call with this place. Anna was super easy to communicate with. All instructions were clear. Anna was even able to arrange my taxi pickup when I couldn't get my online app to work.
The apartment has a new bathroom (great water pressure and temperature) and modern kitchen, which combined with the lovely parquet floor and old (non-functioning) heater make this 16th century building an absolute gem. The bed was fine for me, although I suspect it might feel a bit hard for some. I noticed that the nice black leather couch has a pull-out bed, but I didn't use it.
I didn't want to stay in noisy, tourist-overrun Old Town, and this is a beautiful 10 min jaunt across the Charles Bridge. I felt safe even at 1 am walking back alone. QUIET at night. There are cafes and convenience stores just steps away. Also you're a 15 minute uphill walk to the castle. Go see the sight of the famous Defenestration of Prague that started the 30 Years' War! Basically this place is ideally located right in between Old Town and the castle.
I will definitely recommend Anna's apartment to friends/family and will stay here next time I come back to Prague.