I stayed here with my daughter in July 2010 for 3 nights. I had decided on it through reading the reviews here on tripadvisor for budget hotels in London. It is close to Paddington station, about a 5 min walk. And just around the corner from a great little Italian cafe which served great coffee. And a 5 min walk to a great Indian restaurant, called Noorjahan 2.
The staff at Mandalay Picton were all really friendly, helpful and polite, they serve a good size breakfast in the mornings too. The room catered for our needs with twin beds and an ensuite bathroom. I remember reading some reviews about the ensuites being small. Well, this one had room for a basin, a toilet and a shower. And room to stand and dry yourself. What more does a person need? The shower worked really well, I didn't feel cramped at all in it, or in the bathroom. The room was really quiet also. I always take decent earplugs with me when I travel, but I had no need to use them here.
It was also no trouble to leave our bags with them after checkout, as we had a late flight out.
I'd stay here again with no hesitation.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.