The host was very kind and let us leave our things after the check out, because our bus didn't leave until 7 hours after. Everything was really nice and although the bathroom was shared they kept it really clean.
It was a little bit hard to go up, because the apt doesn't have an elevator and it was on the 6th floor so you had to climb up the stairs.
I would totally recommend here to anyone who is looking for a place to stay near the center of Prague!