Yannis (who we mostly dealt with) was super friendly. We were able to leave our bags and check in early, and he even dragged them up to the third floor for us. When I had problems with the wifi, it was fixed very quickly.
It was very conveniently located by King's Cross, too.
That said, there's only so much you can expect from a room in an old Georgian townhouse. The room was very small -- like difficult for two people with large baggage to move around in. The lack of a lift was also a challenge. But those aren't things our hosts can do much about, and it was definitely a good value given those limitations.