After reading a lot of reviews of this location, I decided to stay for a week and a half. I can honestly say that Sindy has done everything in her power to make the location as good as possible. Even cute little things like a notepad and pen near the table.
About the height: I am 5'10" and had no real problem. I mean, I had to duck a bit to get into the bathroom and to use the kitchen sink, but that's it! The only uncomfortable thing was the steepness/ width of the stairs. With heavy bags it felt a little precarious, but this is beyond Sindy's control.
Main pros: the bed was very comfortable, the location is quite central (walking distance to U of T, for instance).
Main cons: the room feels quite damp at night, Kensington market isn't the safest feeling part of downtown Toronto, and the wifi was not fantastic.
As has been said, this is a great location if you will be using this as a place to sleep while visiting downtown Toronto.