Martin's apartment was fantastic. This is a 5 star review.
Just for background purposes, I live in Manhattan and have been to some very expensive 5 star resorts all over the world so my expectations can be high
Cleanliness: A+
Location: A+. A short walk to old town, the castle, bridges, and on a nice street where you're not mobbed by other tourists
Amenities: A+
Host: A+ even drove me to the airport for about the same price as a taxi
Bathroom: A+ the shower was great
Bed/bedroom: A+
Kitchen: A+
Living room: A+ very spacious
I never like staying in the same spot twice, so the biggest review I can give is to say I'd like to stay here again :)