Great stay - very fun alternative to a hotel! Also very close to metro, Tower of London, and London bridge. There are tons of convenient restaurants right at the dock as well- not the London best but not bad either if your in a hurry or just really hungry.
Showering and pooping take place at the marina steps away from the boat. They are impressively clean and well stocked. I recommend bringing shower shoes because that’s just what we do. There are also washing machines available as part of the marina but we didn’t use them so cannot give specifics or tips. The washing machines are a bit further away.
My kids loved the boat!