Victoria is a nice, centrally located area of London. You have many options to get to where you want to go. I really appreciated that. :)
Joseph's house is a nice London home. Property is very expensive and even more to renovate. I think they did a nice job of creating a safe place to stay. It is not newly renovated, nor are the fixtures lux. If you are looking for that, then a hotel room is a better fit. I think staying in the home of someone who lives in London is a much better experience overall.
The room is true to the pictures. I would have liked the presentation to feel a little more special. However, it was fine. The bed was comfortable, and I slept well. The bathroom was nice a spacious. However, the door doesn't close very well and someone did walk in on me (no, they didn't see anything).
In closing, Airbnb's are perfect for the adventurer. You never quite know what you will get. Trust the reviews and make the most of your stay. Im sure you will end up meeting some very nice people in the end.