I know it will be better no to say it, to keep it as a gem, and be sure to have some the chance to stay in Martin lovely apartment again, but Marin apartment in the historic part of the city, is definitely the best place to stay in Edinburgh.
You have more than you need to have a really pleasant stay.
Also I would like to point that communication has been really easy at all time, Martin is really reactive and flexible, he will do all he can to make you feel home.
Also Martin took on his time to give us many recommendations like night walk with the best views of the Castle and the city.
Also gave us some historical informations, and of courses some nice pubs and restaurants.
All those little things make Martin a super host!!!
Many thanks Martin, all the best, looking forward meeting you again, and spend more time in the city.