I stayed at Whitney's for a week while waiting into my new place, and she couldn't have been a lovelier host. Everything was clean and comfortable, communication easy and thorough; I really appreciated the email clearly explaining rules and logistics before checking in, which made it all really smooth. Even though I'm quite familiar with the city, Whitney still gave (excellent) suggestions for things to do that I hadn't before, so I got to play tourist again. When I had some issues with accommodation after my planned check-out, she immediately offered to help accommodate me a little longer--fortunately it all worked out, but I so appreciate the offer!
Transit links are quite good, and it's quite easy to get into central London, but it is worth noting that you'll have to take either a bus or the Overground, which is fine and still pretty quick! Just not quite as convenient as the Underground.
And, as everyone else has mentioned, the cats are adorable (their foster recently had kittens when I stayed, which was perfect).