All in all, I was pretty satisfied with the stay at Bella's apartment. Check-in and check-out were straightforward and comfortable, the room was ok, however, not very clean, but also not too bad. There was a cleaning lady coming over every Thursday.
There is a bus stop very nearby (2min walk) and in service 24h. The closest Tesco is about 4min from the flat. Another convenience store is directly under the apartment.
In my opinion the price was a bit too high for what it was.
You should also be aware, that the apartment is not located in a very safe area in London. People get robbed and phones get stolen a lot.
Summarizing my experience at the flat I would say it was ok.