Sebastian is one of the best host that you can find. He is really polite, attentive and respectful. He respects your own space and gives you all the necessities in his house. You will stay in a really beautiful flat and you will have you own bathroom with clean towels, shampoo and toilet paper. You will have also acces to the full equiped kitchen with your own space in the fridge and your own wardrobe for your food. He also travels a lot for work, so, when he is away, you will have the full apartment for you.
The Norwood Junction train station is 3 minutes walking from home and the train takes 15 minutes to London Bridge and around 40 minutes to London Victoria. If you go out at night, the go back home is a little bit more complicated if you use the public transport. Anyway, the zone is quite and beatiful, so it's perfect if you want more relax and you don't want to stay in the middle of the chaos of the city center.
I really recommend to stay in Sebastians house. Probably, I will go back to London soon and, if the room is available, I will stay in Sebastians appartment again.