Mark & Doug and their accomodation are highly suggested.
They welcomed us with full felixibility on the checkin, with many tips on Edimburgh and with an amazing house.
They promptly replied to any message we wrote and helped us managing our journey in Edimburgh (how to get the city center, what tour they recommend, what to visit, places where you can eat and drink very well, how to get the airport, etc..).
The house is exactly as shown in the pictures and it is very clean!!
They definitely deserve the 5stars!