Overall a great and highly recommended place to stay:
1. Location: right IN the city centre and 2 minutes to the old town square on foot! Every sightseeings within the old town is walkable. 5-7 minutes walk to the metro station (either Metro A or Metro B). There is restaurant right downstairs or soooo many others can be chosen in the old town.
2. Room: clean and tidy. The room is on the third floor of an ancient building so avoid heavy luggages. And it's three- room shared house. It's possible to leave luggage before or after the check-in/ out time, quite thoughtful.
3. Instructions: clear and accurate. Oleg send me quite helpful and detail instructions before arrival which is really useful. So we don't meet problems in finding the place.
Anyway, highly recommend! Great choice in Prague~