We stayed at Grant's place for our nye weekend in Edinburgh and everything went very well.
Grant met us on the day at the house to show us around and gave us lots of tips on restaurants, bars, supermarket and transportation into town.
The flat was very clean, big and nicely decorated - better than what we were expecting! There's a vast selection of books, DVDs and even Netflix for the nights you want to stay in and just relax.
It is a little bit far from the city (20mins bus?) but it has got very good connections and buses that run frequently so that wasn't a problem for us at all.
We highly recommend this place!

Mariana