There probably aren't enough superlatives to describe super hosts Rob and Emiko. They share their historic Clapham Commons townhouse in every sense: from the immaculate, spacious and well-lit room on the 4th floor, to the kitchen for breakfast, to detailed information about connections to London.
Details: the Clapham Commons area is, in my opinion, ideally located outside the significant hurly burly of central London. It has parks, many excellent restaurants and stores (my favorite is a pizza-by-the-slice walk up!). Once you get the hang of the Tube and bus system using your Oyster card, it's quite easy to get to all the major sites in 1/2 hour (standard in London unless you're staying at the Savoy!).
After long days of museum and monument visits, I found it a relief to get away from the tourist crush to an authentic London neighborhood like Clapham Commons. And to come back to the genuineness and kindness of Rob and Emiko was an added bonus. Both are extremely cultured, yet exude a down-to-earth comfortableness with life that I found very refreshing and endearing.
I would add that being on the 4th floor is an great opportunity for some exercise, and, unless one has very poor knees, should not be put off by that. This is part of the nature and charm of these London town houses. And if you want to go for a jog in nearby Clapham Commons, well, it's 50 meters away. If that were not enough, the energetic Emiko is also always ready to take you along to one of her Zumba or Yoga classes. Rob and Emiko's address will always be my first Airbnb choice in London.