The location is good, next to Warren St and Euston Sq, two different underground lines.
The room wasn't too bad. You have a good size bed, a wardrobe and a desk. If it were room for improvement, I would say the mattress could be looked at, and probably having double-glazing in the windows would be beneficial. If it has already, they are not doing quite a good job. The area can be a bit noisy at night.
But apart from that, the hospitality service was excellent. They had to change one of the lock codes, and the reply to my message was practically instantaneous.