The flat is great with well designed spaces, also Oli and Ben were always in touch.
The location is nearby to Holyrood Park with Arthurs Seat and Holyrood Palace, both "must to go"" sightseeing of Edinburgh. In 5 minutes walking you will will be at the beginning of Royal Miles and at less than 30 in many others interesting places.
I highly recommend it for trips since 3 days or more.