I stayed at Duncan & Dee's apartment over a long weekend with my 11 year old daughter. The apartment was the perfect size, 1 bedroom, very clean, cozy and tastefully decorated. The kitchen was well stocked with appliances and we had absolutely everything we could possibly need. The welcome packet of homemade shortbread cookies was very appreciated.
The apartment is located in a small street parallel to George Street, so it is ideally located. it is within walking distance of everything. Thistle street is full of restaurants and cafés, so a wide range of choice. For being in the center of town, the apartment is not noisy. There's only the bottle pick up in the wee hours that is a bit noisy, but honestly that was not a huge issue at all.
The hosts were very helpful and reactive to any questions I had. Instructions to access/check out the apartment were clear and simple.
I will definitely stay there again if ever I return to Edinburgh and highly recommend it.