The good:
The location is excellent. The apartment is fairly spacious. The host is friendly, responsive and generally very helpful.
The not so good:
The apartment itself. The general feel of the place is that it's seen better days. Some of furniture is old and damaged - on our arrival we found several chairs that were unsafe to sit on (to the host's credit, he replaced them very quickly). Both the furniture and the equipment in the kitchen look like they're leftovers collected from other apartments. The apartment is not quiet, the floorbards and some of the doors creak. There is very little sound insulation - we could hear people in the hallway and neighbouring apartments so loud we could almost make out what they were saying. The furnace in the kitchen makes loud noise every time it comes on (which is often). This might not matter to some people, but we had a young baby and the noises woke up both the baby and us on several occasions.