Jan's place is in the center of Old Town Prague. It is a four minute walk to the Old Town Square. I stayed there for three nights there, December 16-19. The apartment looks exactly like the photos. It is modern and extremely clean. The kitchen is more than adequate to prepare meals in, although I ate out every night. Jan spent about 45 minutes with me when I arrived and gave me great recommendations about sites to see and restaurants. He is friendly and polite. He provided me a guide book of Prague, which proved to be useful. I brought it with me everyday.
Based on his recommendations, I had two very good dinners. My first night I had dinner at Lokal, which is a Czech restaurant across the street. It was very cheap and the Golasch was delicious. My final night, I ate at Restaurant Mincovna, which is also a Czech restaurant. I normally wouldn't eat at a restaurant in the epicenter for tourists, but he told me it was an authentic Czech restaurant. It was expensive by Czech standards, but the dinner was superb. I had the duck. I would have given this apartment five-stars, but the wifi did not work during the time I was there. It was down when I arrived. Jan worked on it and it did briefly work the first night, but then it stopped working. I highly recommend Jan and I will definitely stay there again.