I can only recommend to stay in Piers apartment in Edinburgh!
You will love it for the modern yet comfortable design.
The kitchen is fully equipped and the bathroom had underfloor heating.
I can only say that we felt very comfortable here.
Piers apartment was also very clean.
Location is also good. Just 2 minutes to Bus 35 that will take you to all major sightseeing places. It is also possible to walk to the center.
We did not regret staying here.