Overall we had a very pleasant stay. The location is perfect for visiting London, you're only two tube stops away from the museums and the Royal Albert Hall, and one tube stop away from Paddington for those arriving by train. The hotel is situated away from the main high street so you don't have to deal with any noise from passing traffic. Additionally, the view from our room was delightful. The rooms and communal areas were clean and kept that way throughout our stay. Staff were also approachable and friendly.
The only reason that this hotel didn't get the full 5 stars is just due to how much noise travels. The hotel is comprised of what I imagine to be Edwardian town houses. This makes for lovely views onto the square, but not very good when you don't want to hear your neighbours chatting, or when they put the toilet seat down. I am a light sleeper and was woken a few times over the course of our stay, unfortunately on one occasion it was because I was hearing a couple arguing and then "making up"...
However with that being said, the positives far outweighed the negatives, and for the price we paid, we were relatively happy.