I stayed for 8 nights and for the price I paid it was an ok stay but nothing special.
Pros: the apartment is spacious ( for London standards) with all amenities
Cons: Train noise is real and can be irritating as it runs from morning till 1 am, no car parking, the building is old looking, the apt needs some maintenance in areas such as paint on walls, cupboard fixing etc , the internet is also just ok but it’s not super fast ( my GoPro 4K footage wasn’t able to be uploaded on any of the 8 days as router would drop connection after 5 mins)
London is an expensive city so your experience will vary based on what you are paying for the stay. For what I paid, I would probably get a hotel room next time. Overall an ok stay but be vary of the train noise.