This was my first AirBn'B experience, so I must say that David has set the bar VERY high! :)
From very quick responses to my e-mails and/or text messages to having travel guides, reading books, maps, info leaflets and all the essentials right at our disposal. He checking in with us on the day of arrival and on the departure about how we are travelling and settling in. There is also a provided "Welcome information package" that lists all the best (and closest) shops, dinning places and markets - I used it to find places more, than my actual travel guide...
The place and the whole experience felt cozy and warm, right in front of the Edinburgh Castle, in the heart of Grassmarket.
This also was my first trip to Edinburgh, which despite me getting a severe cold and flu, was UNFORGETTABLE!!!
Overall experience is more than positive!

Oh... if any photography enthusiasts stay there - I would suggest try to make a time-lapse from David's balcony towards the castle - the light there is AMAZING! We were lucky enough to experience the first sunny days in Edinburgh and the morning sunrise and evening sunset coloring the castle brightly orange/red/yellow was a sight for sore eyes! Also ... one of THE BEST spots for a morning coffee... :)
I probably will add David's apartment to my Edinburgh "musts" and next time will request the same place - that's how much I have enjoyed it!

If you have any other questions about the experience, please, do not hesitate to contact me - will answer at the earliest convenience! :)