We recently spent 3 nights at Catherine's lovely flat and really enjoyed the experience. Catherine is a great host--easy to contact and very responsive to any questions. The space is small but professionally designed and full of lovely natural light. It is close to lots of great bars and restaurants but is on a very quiet side street. It is very close to public transit so it's easy to get around. Catherine's list of favourite spots was also much appreciated. As others have mentioned, the outside of the building looks a bit dubious but the apartment is bright and clean and very well equipped.
I would highly recommend Catherine's place.