I stayed here for a week and had a pleasant stay. The apartment is in a very nice part of the city in a renovated building with a modern lift. There is a tram stop conveniently located in front of the building, which will quickly take you to the central area of Zürich and the main train station in one direction, and to another train station (Tiefenbrunnen) three stops in the other direction (for easy access to the smaller towns along the lake). The two major grocery chains (Coop and Migros) have locations across the street, so it couldn’t be a more convenient location.
The apartment is on the 5th floor, but stayed reasonably cool even on very hot days. Even in July, it was possible to sleep comfortably with the windows closed, though I also used a fan. The tram noise that some have mentioned is not loud (in my opinion), but you can hear the tram approaching and departing if you are listening for it. I slept with the windows open for several nights and it did not bother me at all. The bed is comfortable, the bathroom is very spacious (huge shower!) and all the necessities are there in the kitchen. Communication with Chris was great, check-in and check-out instructions were simple and clear. Good value for money if you’re looking for a clean, simple place to stay in a really convenient location.