Many thanks to Tommy for his hassle-free hosting of a great stay in London.
First off, and most importantly, this is a very affordable Air B&B in a super-great location. The instructions are straightforward (key safe and whatnot), it has two good sized double bedrooms and a decent lounge, and it's directly above Sainsbury's for extra DiY & BYO convenience.
On the other side of the coin, the flat is for sale (see Rightmove) and has been pretty much cleared out of homely touches. It's also... period (ie a bit tatty), very basically / sparsely furnished (eg cheap mattresses and bedding) and characterful / idiosyncratic (eg taps that sometimes work much better than at other times). Lastly, it's on a main(ish) road and can be a bit noisy at night.
So, on the one side = ease, affordability and convenience: on the other side = a bit rough around the edges. On balance, and considering the amount of time we were actually 'at home' during our stay, we'd do it again - and once again spend what we save on the going out bit. Your decision is whether or not you elect to do so too..?