Spent a few days here commuting into central london, and although I had to leave early for personal reasons, Carlos quickly replied and arranged for me to give my keys to the other guest while he was out.
The room, kitchen, bathroom, etc. were exactly as in the pictures and although I didn't really use the kitchen it would be fine to make a meal with. There is a Co-op and a few nice takeaways places nearby. The desk is fairly small and worn, but it was fine to use for a day when I unexpectadly had to work from home. Travel wise, Brockley overgound station is a 10-15 minutes walk from where you can get to Canada Water quickly, and then change to get to Central London. 35-40 minutes to Green Park.
So overall I would recommend the room, especially given its good value for money. It is probably best suited to shorter stays but Carlos has another, larger room (also on Airbnb I think) which would probably be better for longer stays.