Great and super cheap place to stay in London that's really close to King's Cross (and by extension either close or easy to get everywhere you'd want to go), the place may not be the biggest but for the price and for a trip where you just leave your luggage and go exploring it's perfect.
Alex is a great host, although he was an invisible one for us, but his instructions and help was absolutely spot-on and the best I've seen on Airbnb.
The only downside which could be a major one for some people is that the room and bathroom/toilet can get really cold in winter.