PROS: Centrally located, cute neighborhood, well connected (to Heathrow), room has all the general basics (kitchen where can make simple meals, with coffee and tea provided).
CONS: The host changed my reservation last minute to another flat (due to some kind of repair that had to be made in original flat). The overall decoration in the flat was a bit drab, grey, sterile, with very little originality. The curtain especially just looks kind of depressing and run down. The kitchen, while decently equipped, had some cups and dishes that didn't appear properly cleaned, with smudges and the tea bags looked stale and soggy, like it has been sitting around for awhile. Some parts of the kitchen (in the fridge particularly looked like it needed a good repair/update). You can't open the window, which for me, especially during these times, was disappointing in terms of a hygiene perspective. Air circulation is important and this room somehow made me feel trapped with heavy, stale air. For several days, there was garbage left by the front door (inside the complex) and it seemed like there was no regular cleaning.

I think the host owns multiple flats in the same complex and it is a self check in, which is fine, but a bit impersonal. You need to download an app called Klevio to check in, which worked well (minus a few lags here and there). The main issue I faced was on my last night...I had extended my stay by one more night and the host forgot to extend my stay on the Klevio app. My phone was running very low on battery so I rushed back to the flat in case it died to charge it (since this is the main way you enter the complex and flat, you get no physical key), luckily the front door was open somehow, but then I got in front of the door to the flat, opened my app, only to find that the host didn't extend my stay on Klevio, and I was basically locked out. Then, a few minutes later, my phone died. This lead to me having to run around the neighborhood asking people in shops if I could charge my phone as I didn't have a charger on me. Given that I had a hard time finding anyone with the proper phone charger (I have an Android, everyone seemed to have an Apple), I had to go to an electronics shop and buy a charger...then I tried to open the AirBnB app and I kept getting an error message which meant I couldn't contact the host. This lead to me spending an hour on the phone with AirBnb and the support staff informed me that they would contact the host and let her know that she should update the Klevio app. For some reason, AirBnb informs me that the host refuses to update the app unless I call her (which was a headache for me as I had limited credit on my phone to make calls). Then I call the host, who to my surprise, acts like she doesn't know what happened/like she is clueless, and doesn't even know why I called. I found this particularly frustrating since AirBnB had just informed me that they spoke with the host. The host didn't even bother to apologize, acted rather smug on the phone, saying she would just let me in (which I didn't get...I mean, what if I need to go back out again and come back, this wouldn't solve the overall problem)...the main issue was that my stay needed to be extended on the app so I could come back and forth from the flat as necessary. This whole issue ended up wasting my time and my money. I ended up having to cancel an important meeting that evening as the whole ordeal ate up two and a half hours. Maybe when everything is going well and you don't have to interact with the host at all, I wouldn't have felt this way...but the fact that she was impersonal and unapologetic to my situation on top of the fact that I got locked out was disappointing, to say the least.
If I didn't have this issue on the last evening, I would have mostly been pretty satisfied with my stay. Even though the room is pretty basic and slightly rough around the edges, it's in a nice neighborhood, central, decently priced, which is pretty good for an expensive city like London. But the difficulty with the app, really left a sour note on the whole experience, and I think that there needs to be a backup option clearly communicated to guests should this happen (as I am sure I will not be the only person this happens to).