We really enjoyed our stay at Ainara's :)
The room and the flat were really clean (I believe she cleaned the whole bathroom at least 3 times in the 4 days we were there). Towels folded on the bed when we arrived, simple but good breakfast was ready for us every morning in the kitchen.
Everything was well organized: instructions were clear, Airana welcomed us nicely on a friday night at 11pm, we didn't see her so much after that but that's not the point of Airbnb (that would even rather be on the plus side I suppose).
Most important : the location is amazing (that was why we chose that one). 5min walk from Hyde Park on the west, 2 minutes from High Kensington underground station on the south, 10min from Notting Hill on the north and the area itself is also really cute.

On the down sides, there was some noise in the morning because of some constructions in the nearby church (plus the noise of the church itself on sunday morning) but we didn't go for sleeping anyway so that was not a problem for us.
Another point worth noticing, we weren't sure whether we would have the flat for ourselves or if we'd share it (though we expected the latter). Answer is the flat is shared with Ainara plus a second Airbnb room.