A cozy small room in a great place. It's a short walk to the train station, national museum, and Old Town. Good communication with the host, and quick response. The room was super clean and as pictured. As noted the apartment is on the highest floor without an elevator, so after a day of strolling around in the city, it might take some extra strength to get home.
Also, be aware that he's renting out multiple rooms, so you'll probably have neighbors.
Overall, a perfect place to stay when visiting Prague.