We just stayed a week with Phyllis over the new years, and we really, really loved the place. The location is superb for enjoying anything in central London and Westminster, with "everything" within walking distance.
We also had our little son (just under 1,5 years) with us, and although the elevator is a bit small, we managed to bring the pushchair/stroller up and down every day.
The room was fine, and she even had a baby bed we could use while staying there.

And both he and me and my wife enjoyed to stay with Phyllis. She took great care of both us and our son, and was always ready to provide him and us with little treats and good advice to make our stay such a memorable event.
We were even invited to her New Years Party, which we loved, with a nice bunch of people from all over the world.

So this place is highly recommended if you want to stay in the center of the city for a while.