Excellent choice.
It was my second time in Edinburgh, this time with my wife and our daughter.
The flat was comfortable, nicely decorated, fully equipped and toys & table games for kids.
It is perfectly located on a cute little street with nice shops, bars & restaurants only 3' walk from Shandwick Place where you can catch the Airlink Bus to the airport (20').
The location couldn't be better: walking distance from main touristy spots (5' to the Princes Park / 15' to Waverley train station / 20' to the Old Town or Calton Hill) PLUS also 20' minutes to more authentic and coolest areas like Stockbridge (to the north) or Bruntsfield (to the south).
On top of those 'technicalities', what I appreciated most was the 'old-school-airbnb' feeling: staying in a real flat with real hosts. Nowadays it's more common to crash in a standard 100% ikea-furnished and ghost-managed soul-less apartment. This one was real, and we loved it.
Another great thing is that Hanne let us leave our luggage past the check out time so we added almost half a day to our visit.
I strongly recommend this option and I would definitely come back again
Thanks Hanne!