We stayed at Martin's apartment for three nights in November. The location is amazingly central and the apartment just as described. He also left food and drinks available for our use, which was nice. The only thing to know is that it is up quite a few flights of stairs (79 stairs if you're counting), which might be three floors in Europe but was more like 4 stories up as an American would count it. Also, it's on a pedestrian street. Even with the central location, the windows kept the noise reasonable as long as they were closed. I would highly recommend this place to anyone staying in Prague.