Wonderful flat in a prime location for exploring all that is London. On a nice quiet residential street that is only a 2 minute walk to Earl's Court Underground station (serves 3 lines - Piccadilly, District and Circle). You can take the Piccadilly line directly from Heathrow to Earl's Court (about 45 minutes). Easy!!
The flat is a "basement" apartment, so there are a set of outdoor stairs to navigate when entering/leaving the flat. Not a problem for us. And, we had no issues with noise from anyone in the flat above (very quiet).
The place is smartly designed with 2 good sized bedrooms and a very usable/stocked kitchen (we had breakfast each morning at the flat). The washer and dryer are a bonus (less to pack for a trip).
Would absolutely stay here again. LOCATION is amazing, flat is well maintained and clean, and the hosts were able to be reached if needed. We were even able to check in earlier than expected.