Starting with the outstanding, like 6 out of 5 stars good: the service/hospitality. Prakash, Conan, and everyone else, were absolutely delightful. They were welcoming, witty, and most importantly, incredibly helpful. Service truly made the stay worth every penny.
Good: the room (I was on the 1st level) was as pictured. Yes it's small, but accommodating for a solo traveler like myself. It had everything I needed--a CLEAN and comfy bed, TV, and storage for belongings. The ensuite bathroom was clearly a later addition to the room (it steps up into a space no larger than a closet or airplane lavatory) but again, I'm here to be out and about so it got the job done (water was nice and hot).
The room was good, but minor improvements and touch ups are needed. For example, the hanging light above my bed did not work, and was really just hanging in there. Some of the crevices could use a good wipe/dusting (along with the vent in the bathroom).
I read a number of comments about the proximity to Paddington Station. That's a huge selling point for me because it opens up all of London. On my level, the trains didn't bother me at all. At most, it occasionally sounded like a light thunderstorm (which was relaxing), but honestly I rarely heard it and I kept my window open most of the time.
Overall, it's affordable and gives you everything you need if you plan to explore London. The hospitality alone would put this high on my list.