I did extensive research to find an affordable airbnb that 1) had two comfortable beds for two guests (many airbnbs at the time of my research had a full sized beds to accommodate two travelers and for me that's too tight for sleeping corridors) and 2) close to public transportation. Tilda's check marked all the boxes! We were provided fresh linens and towels, as well as a water pitcher upon checkin. The shower was good with hot water, and I loved interacting with her friendly cat. The home is very simple, but homey and perfect for my needs.
If you're coming from the airport take the Heathrow Express (£25 = $30.54) then transfer at Paddington Station with an oyster card (metro card: I bought a week long card for £75.30 = $91.99) on the Bakerloo Line. Her place really is minutes walking to the station - which was perfect since my friend and I were always out and about exploring!