The flat is amazing! Very close to the tube and the overground! Pubs, supermarkets, parking lots, shops, everything you need is in the nearby. Great location (though the area isn't that peaceful at night).
Keep in mind you'll have to deal with one flight of stairs, what can be a problem if you have difficult carrying your own luggage.
Main problem is: the flat isn't fully prepared for 4 guests!
Were we only 2 guests, everything would be perfect! But that was not the case. We were 4 adults, and it was clear from the beginning.
First problem: the sofabed is a nightmare for 2 adults. Needs a replacement. We tried covering the "mattress" with some blankets and it became almost acceptable (we stayed a fortnight!).
Second and main problem: hot water! The boiler is REALLY small, so if you're more than 2 people, forget the *luxury* of having hot water in the bathroom and kitchen sinks. Keep focused only in the shower, but do not leave the shower faucet runs free, otherwise you'll end it up receiving freezing water. We talked to the host, many times, they were always friendly and prompt to help but there's nothing they could do at that stage. We were there, in the middle of the London winter, for 2 entire weeks, and the flat had a small boiler, not even close to ideal to furnish hot water for 4 people.
Another point: check-in. The flat has a keyless access lock running properly, and also a tradicional key (I suppose the area isn't safe enough for them to trust only the keyless lock). So they ask you to always lock both. Ok. Problem is: you have to collect the keys in a shop 10 min walking from the building. And also return the keys there, by the check-out. The shop was supposed to be open 24/7. Ok, for the check-in, we arrived, lots of baggage, I walked alone to the shop, in 20 minutes was back with the keys, great! However, at the check-out, our flight was 6am in Heathrow, so we had to return the keys in the middle of the night. And the shop was closed!!! And the lad at the neighbor shop said it's not a 24/7 shop. So I had to walk back to the flat, leave the keys inside, trust in the keyless lock and text the host that I'd lost time just to do exactly what is expected to do when you have a keyless lock in a flat. A bit frustrating.
Those sad points did not ruin the whole experience of staying in the flat for a fortnight, but I consider my moral obligation to alert other guests (and the host) of the points where they need to improve, because the flat is really great and we deserved a better luck!
I'm giving it a 4 out of 5 stars because, honestly, I would comeback, but not as a group of four adults. Just me and my wife. It would be great!