Simon's loft is easily accessible in Edgware, though a bit out of London (about 45 minutes with bus and Tube). Sainsbury Hendon is less than a 15 minute walk, but make sure to check their closing times (Sundays they close at 4.30).
Cooking, baking, washing amenities are all available. The bathroom is clean and uncluttered. Wifi is generally great (we had issues with a laptop connecting) and remember to bring an HDMI cable if you want to stream your shows as Simon's TVs are not connected to WiFi.
Simon was a great host, easily contacted through Airbnb message and prompt with his reply. He allowed for a late check-out which helps if your flight out of London isn't till late in the day.
10/10 would recommend!