We stayed at Ali's place for four nights in late June, and would give this a "highest" rating. I will try to be systematic in my comments:
1) Ali's communication was prompt (replying usually within the hour) and helpful. He even added light-blocking curtains to help our daughter sleep.
2) the check-in instructions were detailed and helped us get in the house quickly without problem.
3) the location is lovely - a 20-25 min walk from Toronto's main beaches and lakeside park, the neighbourhood is dotted with green space; it is in the funky zone of Queen St East, served by the tram that passes around every 5 minutes. it is also close to Coxwell Rd, and a 5-minute bus-ride to Coxwell station on the Toronto subway system; and a 5 min walk to the closest BikeShare station - all that to say that it you don't need a car to get you around to spots accessible by public transit !
4) the apartment itself is darling - the girls loved the decor, including the book collection ! Ali keeps it really clean, and provides all the essentials like towels / linen. Everyone remarked on the comfortable mattresses - (though if you like super-firm mattresses, they may not be for you) - I found them to be more of the cradling / support kind - we all slept well.
5) There is an upstairs neighbour, but our experience was that s/he was very quiet and considerate. The house itself is on a quiet side-street - we slept with windows open and were not at all aware of traffic or other human noise - the birds were another thing though - they are very enthusiastic in June.. :)
We had a great time there and were very happy with the place - can't say enough about how Ali has set it up, its great location and convenience.