I would say that the greatest feature of Dmitriy's apartment is it's excellent location: pleasant area, lots of bars, shops, cafes nearby, a grocery store right down the block and 10-15 minutes walk to the central attractions (except Grassmarket itself).
We didn't get a chance to meet Dmitriy in person and communicated via whatsapp, anyway, Dmitriy was absolutely reactive, very welcoming and provided us with all the information we needed.
The apartment was clean, comfortable and contained everything we needed, however, it may be seen that soft renovation is welcomed. Also as we stayed during the winter season and the flat is located on the ground floor, it was quite coolly (even with the heater on and a special air dryer).
Taking everything mentioned, we would recommend to stay at Dmitriy's apartment. Thanks for a pleasant stay, Dmitriy!