The place is not in the centre, but that is not a problem since there are multiple tram lines that can get you almost anywhere in Prague that you can catch a few meters from the door of the house. At 5 minute walk there's also a metro station, with even more tram lines nearby, if you need to go somewhere more specific.
The appartment is ok, not elegant or fancy, but you'll find everything you might need even for a prolonged stay like mine (2 months).
The host is great, with quick answers and very keen to help you out. The only real problem I had in all my stay was with the vacuum cleaner, which was in a bad state probably because of previous guests misusage and scarse maintenance, but Jan bought a new one very quickly and lent me another one in the meanwhile. Also, if sunlight wakes you up easily and that bothers you, you might consider bring a night mask with you, since there are no curtains in the bedroom.
I recommend both the place and the host.