We had a truly excellent London visit onboard Jessie. The boat is very well maintained, clean, comfortable and cozy. I can't even describe how much fun it was to know that we were in the middle of one of the world's largest cities, but the "noise" that met us each morning was quacking ducks, not traffic or police sirens.
The boat is narrow but everything is purpose built to function. We had some concerns that we would feel cramped (I am 6' 200lbs) but that was not even a slight problem.
I would HIGHLY recommend staying onboard Jessie to anyone who asked. We are already planning to stay with Meg again when we can return to London.