No complaints to be had, but manage expectations when it comes to space.
When the staff couldn't find my booking they worked quickly to sort it out, to their credit.
The room itself was a compact double with a window - if you have a suitcase you may struggle for room but if you're there for a couple of days with a bag you'll be just fine. It's got a decent sized bathroom, a safe, and a really good set of blinds that blocks out all of the light. Plus, the windows reduce a lot of the street noise, so you'll sleep well.
The windows don't open, but the climate control is excellent - our stay was during a heatwave and the cool air was wonderful, especially at night.
If you can get over the minimal space, it's a good place to stay. You're close to the Bethnal Green underground station and you're close to two overground stops. I'd certainly stay here again.