We had an enjoyable stay. Room was as described and as tiny as we expected. It was roomy enough for an adult and a child, but would have been a challenge for two grownups. The bed was comfortable, and everything tidy and clean. I wasn't bothered at all by the separate toilet and shower. We had to only wait once to use the shower, not a big deal.
All in all a good experience. The room was so tiny it encouraged us to explore London, which was our main reason for being there anyway.
Great coffee and breakfast and other food in the neighborhood. I'm going to recommend The Roasting (perfect flat white and lemon biscotti), Pimlico Fresh, and Cambridge Street Kitchen for local delicious food. Easy walk to Victoria.
Would stay again if I was traveling alone.
One suggestion: the shower could use a small shelf for toiletries, as it's so small to bend down.