We stayed on the barge for 6 nights with our 2 boys (6 and 4 y). Location (Little Venice) is just right - 3 tube stations in 10 min walk. Hyde park about 25 min walk, perfect.
We loved the experience, especially the boys - getting on and off the boat, running the engine, the bedroom, adding some coal to the stove, etc.
Sam is welcoming with some fresh bread, jam, milk and eggs - perfect for a breakfast or a lunch if you're straight off the plane or train.
You need to remember that you will be on a limited power and also water and that to charge batteries the barge may not be run anytime in 24h - neighbors also want to rest. But it's good news because you may review your priorities and even change your habits to better.
Sam is a wonderful host - very helpful and caring.
The barge is very clean and cosy with all the equipment you need. To inform - no TV and no hairdryer but you don't need it.