The idea of staying on a narrowboat in Little Venice sounded great. The reality turned out to be different. First off, the boat which we paid for was not the boat we were given. The boat we ended up with had less sleeping space, inferior beds, no bath, and wasn't as nice as the boat advertised. Unforgivable.
Second, the boat we were given was moored for the first few days in a stretch of the canal that resembled an algae swamp. When it was moved to the picturesque Little Venice basin, the host moored another of her boats alongside us completely blocking the view.
The last straw was running out of water on the fourth day of our stay (despite using it v.carefully) because the host had not replenished the tank as promised "every few days".
With a bit of care and consideration, I think all of these things could easily have been avoided.