Really enjoyed my stay in Jiri's apartment. It's in a great location in Mala Strana about a 10 minutes walk max to Charles Bridge. It also sits literally right at the foot of the trails leading up to Petrin Tower. Close to everything you might need (corner stores, grocery store, bars, restaurants etc). The apartment is nice and spacious as well. Not to mention Jiri is a really cool guy and recommended a couple good places.