In all, the Adria is...

Liked: The room at the Adria was small but clean and well-organized. The shower was a bit tight, but the room itself was very quiet and comfortable.
Disliked: On our last morning, there was no hot water. We were under time pressure, so we didn't report it and have it fixed, which I'm sure the Adria would have done.

Very good

Exceptional

Liked: Staff were welcoming and informative. The room was clean and perfectly equipped for a short stay over whilst taking in a show.

Disappointing

Liked: There was not hot water so was unable to get washed in warm/hot water which was very disappointing as needed the facilities as going to an engagement today. Room was hot but the lovely proprietor sorted that out for me. I did complain about the water this morning to a lady but she was very unhelpful and only intrested in key cards not being lost and £5 charge.

Excellent

Liked: The hotel was very close to the tube and easy to find. The staff were all very friendly and helpful. They even stored our backpacks the next day while we toured London.

Very good

Superb

A perfect place for a...

Liked: The room is small but has everything you would need for a short stay. What I really appreciated were European outlets and the possibility to charge your phone by plugging usb - it really comes in handy in case you forget the adapter.Aside from that, the room was clean and warm. The receptionist was very friendly, had a chat with me and explained in detail the rules of the hotel and surroundings. I definitely recommend!
Disliked: One small complaint would be the fact that the walls of the corridor are a bit thin - I could hear the people entering their rooms as clearly as if they were next to me, although I couldn't hear my neighbours in different rooms:)

Superb