Nicola's basement flat was a great base for my trip to London. It's about an 8-10 minute walk from the Fulham Broadway tube, and there are point-to-point city bikes to rent at Eel Brook park just a few minutes away.
The flat is stylishly done up, has a smart TV, and is great for a short stay (no cooker or clothes washer, but has a combo microwave/grill, fridge, kettle, and even a mini-dishwasher).
Other reviews have remarked that the pull out sofa was super comfy, so it's clearly a matter of taste, but I found it really soft -- the mattress is made of foam, of the non-memory variety -- and ultimately slept on the sofa folded up.
Nicola, who lives in the house above, was quick with communication, but not pushy and left me peacefully to myself.