I stayed at Simon's place for a week and must say it's one of the best experience of renting for me. The flat's very clean, new and spacious. There's nothing unnecessary in it. Simon is very polite, punctual and remarkably thoughtful host. All mentioned makes feel independance and comfort. Vyshehrad itself, located in 3 minutes of ride from downtown, is very nice place with panoramic view and good infrastructure.
I would certainly stay there next time and highly recommend Simon's flat to my friends travelling to Prague.