Great location - safe area to walk at night. Nice view from the apartment and it feels homely. Quiet and not much noise from the street or neighbours. Soft and comfortable mattress.
The main problem I found is the hot water heating for showers - you must turn on the switch one hour before you wish to shower as it takes this long to warm up for 4 minutes of hot water. Towards the end of my stay there were times where the hot water didn’t work at all.
Be aware that the apartment is up many flights of stairs if you have heavy baggage.
The key collection and drop off process is a little inconvenient but if you’re in an uber you can just add a stop which I found to work well.
Also - apartment wasn’t the cleanest. I found someone’s old crusty eyelash extension stuck on the table whilst mid mouthful of food.

Regardless of the issues - if you’re looking to do London on a tighter budget - I would recommend this airbnb. Having stayed a few areas around london now, this part of Kensington is definitely the safest and nicest.