For Airbnb homestay network travellers, you should know this is not an appartment as listed but a hostel. Not a bad one, but a hostel.
If you're okay with this then location is London, that is a given great location, close to Portobello, far from main downtown tourist London attractions. Mind the maybe head of reception; harsh, not just cold in her communication but innacurate. Being in the reception lobby I was asked coldly and in a 19th century school manner to turn down a short whatsapp message on the grounds that this was a public space (I never knew it was not allowed to listen to a whatsapp message in a public space), and when I turned it down to a volume it was almost hard for me to hear (her tone had been so harsh I made a good effort not to call her attention again) she did call my attention again, when I realized that she had actually meant turn OFF.
As well they wanted to keep my passport retained in reception, which I was not eager to comply with and at 11pm I had to stand for my rights under threat of not being allowed into my already paid for room.
Lastly, the heating went out during more than 24 hours, and when I asked about it I was answered that that is the way it works since it is automatic. This was january with max 2 degrees celcious. And mind the showers on the ground floor, try finding the ones on the higher floors. Breakfast with no fruit, cereal is great, I just love British cereal.
The cleaning staff is great energy.
Cheers!