The apartment is very central in the new town in a street parallel to george street where the silent light is taking place in Christmas 2018. It is almost 5 min walking away from Princess Street and 14 min from the train station. We did not have to take the bus or tram. It is surrounded by good restaurants and bars although the area is quiet. We got some discounts listed by Harry (uber, restaurants...).
We self-checked in late at night and Harry gave very clear instructions. We did not have the opportunity to meet Harry but he was very reactive replying to our questions.
The apartment is clear and very well styled. it is located on the "second" floor. It has no elevator. It was not a problem for us since we had no big luggage.
I recommend this place if you are in Edinburgh!