I stayed on my own for 5 nights in a room with private bathroom.
The best thing about this place is the location. Easy access to everything you want to see in London, tube, buses, and clipper. Near Covent Garden (tube to airport), southbank, etc.
As to the comfort of the room: the bed was OK, not the best but bear in mind this is not a 5 stars hotel, bathroom and room small but enough for one person, no TV nor air conditioner, but I was able to sleep anyway, and considering I wanted to see London it was enough.
As to the facilities: staff is very friendly, some of them speak spanish which made it easier, there is a fully equipped kitchen, a Tesco right across the street, opened till 1AM-
I would not reccomend for a couple or someone suffering back problems.