I do not have enough good things to say about Pauline's flat. First the location is fantastic. The flat is in a quiet neighborhood and is close to several great restaurants and pubs, a supermarket (Aldi), as well as an Underground Station and bus stop.
The flat itself is a good size (perfect for our family of five). It was extremely clean with two comfortable beds and a pullout couch. Showers had great water pressure. We spent every morning drinking coffee on the deck listening to birds and even saw a few foxes in the greenway down below!
Pauline was very communicative during the process and went above and beyond to give us an early check-in when we arrived. This was a lifesaver as we got into London around 10am (2am our time) after an 11 hour flight and were completely exhausted.
Abdul was our on-site contact and he couldn't have been more helpful. The check-in was very smooth. He also made himself available by text and quickly answered several questions we had throughout the stay. Really great guy.
(One thing to be aware of and it's not a negative just an fyi - you do need to go up several flight of stairs to get to the flat and there isn't a lift. Just a note if you're older or may have trouble carrying heavy luggage upstairs.)
Overall, the stay was really quite perfect. I highly recommend Pauline and her flat if you're thinking about coming to London!