So this hotel left me a bit torn. The staff are very friendly and helpful and the location is pretty good. It is about 5-8 minutes walking to beer street and the main popular area of Old Quarter. It's also a similar walk (in the opposite direction) to the famous train cafe street. So, looking at it that way, things were great.
However, I wouldn't really recommend the windowless-room here. It feels and smells like mold is inside, and the room always felt humid and damp. It is hard to filter the air in a room without windows, but after exploring the city and seeing other places, I would guess you can find a better situation for cheaper elsewhere. It has hotel prices, but like many other "hotels" in Hanoi, it's more like an apartment building with an elevator. Also, I was unlucky to be on the floor below the breakfast floor (8th floor) and they had been doing construction my entire time there, so you couldn't sleep in due to banging noise.
Anyway, all being said, if you get one of the rooms with a window, I think you'll feel fine. Again, staff was great, but it felt like the value of what you get wasn't equaling out.