Dennis's place was very nice and modern. The room was very big, probably the biggest room I stayed in during my 2-week Eurotrip. His place was very clean.
I wasn't able to meet Dennis, but he gave me clear instructions on getting to his house. Dennis also followed up with me asking how my stay was going which was very nice of him.
The location for me was just okay. It was a bit far from the major London tourist attractions, however the metro station was walking distance so transportation was easily accessible.
Overall, I had a great stay at Dennis's place!