The apartment is nice (not luxory) and overall well located, very close to the underground in a very nice little neighborhood.
Still, just out of the few nice streets around, there is not much more to see, except the nothern model part of the City: to me it was a good experience (walking in new places I did not know, and e.g. visiting the Barbican cultural center) , but if you want to be located inside the "old" London, this is not the perfect location.
The apartement is nice, and there is almost everything in the kitchen, even if we had to buy few additional things: I think the two very kind owners are now at their "start up", and in a short time the apartment will have everything needed.
The bathroom is quite small, but I guess this is quite standard in London.
The apartment take a little it of time to get warm, but then the heater work very well: my suggestion for the owners is to turn the heating on few hours before the guests came in, and the arrival will then be perfect !!
My overall experience is good, even if the price was not cheap compared to other solutions (I would say a fair price).
My personal judgment, after some other "airbnb experiences" is that this is a nice apartment, similar to a very nice hotel room, but it is not a "lived" apartment, with pros and cons, depending on what you are looking for (for us, was perfect in this case).
I have to thanks again Lydia and the other kind landlord, for their availability at all my requests, and for the good time we spent in London in their apartment.