Mark is a very friendly and relaxed host! We (3 persons) enjoyed our staying for three nights. The appartment is perfectly located for exploring Edinburgh, the room is as described large and sunny. If it's not foggy and raining you can see Arthur's Seat through the windows, the bathroom is nicely decorated - a new plant will come soon :-)
You can trade your chocolate for coffee and tea :-)
Mark showed us his favourite places for haggis, beer, music etc on the map.