We didn't stay in Aviva despite we booked 6 nights, because of broken pipes damaged the roof of the room we reserved, so officially it is not appropriate to leave the feedback.
But I insist expressing our deep thanks to Boris and his wife here that, they were very helpful looking us a place to stay, very nice making sure everything was okay, while at the same time dealing with the all-in-a-sudden damage.
From our couchsurfing experience(a night at their living room), we can at least tell you: the apartment is perfectly located with most things around, neighborhood is quiet and safe, and they are genuine people to trust.