We stayed at Grassmarket snug for 2nights before Christmas.
Liked following things:
A) Location of the snug is perfect as its centrally located and very near to castle with lot of options of restaurants nearby
2) Ashlie and Grant had given the list of to do's and bus timings which was very helpful.
Things which we didn't like:
1) Approach to the apartment in the building is not very good.
2) Seems slightly smaller than the pictures