Martin is a really nice host. He explained everything about the apartment to us. He also let us leave our luggage at his place after the checkout time.
The apartment is really close to the tram and metro station. If you prefer to walk everywhere, it's also doable. Me and my friend walked almost everywhere, not short walk to major tourist places but not bad. There is also a shopping mall within 5 mins walking.
I definitely recommend Martin's place if you prefer to live in the residential side of Prague away from the tourists.