If you're looking for lots of space in London, this is your place! By London standards, this apartment is enormous. It's also in a great location, about an 8-10-minute walk from the Earl's Court tube station and close to lots of restaurants. The apartment is on a beautiful, quiet residential street, and I heard no noise from neighbors during the week I was there.
Pros: Spacious; quiet; gets lots of sunlight; close to public transport; great modern bathroom; tons of cabinet space, both in the bedroom and the bathroom; powerful air conditioning; very responsive host; fast wifi; very clean bathroom and kitchen.
Cons: Lots of stairs, including within the apartment (the kitchen is three tall steps down below the other rooms, and you have to go up a flight of stairs from the entry to the kitchen); not ideal for working on a laptop (the only table is in the small dining room, right underneath the air conditioner); no trash cans (zero--not even in the kitchen); very basic kitchen (no coffee, tea, or sugar; very limited number of eating utensils; no dishwasher, dish drainer, or dish towels; no nespresso or coffee maker beyond an old French press); somewhat annoying check-in process if you have luggage and are coming from the tube station (you have to walk a few blocks in the opposite direction from the apartment to pick up the keys, then backtrack).
Overall, I had a very pleasant stay, and I would definitely recommend the apartment to anyone who values having lots of space to spread out; you're unlikely to find a larger, nicer place for the money in such a central location. One issue I ran into is that the host canceled my original reservation for a different apartment (one that appeared better suited to my needs as a single traveler without any use for so much space) a week before I was scheduled to check in. Thankfully he offered this apartment as a replacement, but I would have preferred the smaller flat with a more open floor plan that I had originally chosen.