Mel's place is super clean and nicely furnished, we felt very welcome there. Mel himself responds quickly to all messages and offers all his assistance on arrival and throughout the trip. He also has a little booklet with information prepared, which comes in very handy.
The flat is located about a 30 min walk from the Royal Mile, but considering the beautiful streets you walk through when getting there, that was no issue at all for us. Otherwise there is also buses going right from the doorstep to the City Centre.
We will definitely come back to Edinburgh and (hopefully!) to Mel's place.