This booking was a great deal - you won't find a hotel room in Pimlico for a comparable quality at this price.
Alessandro was very welcoming. He was flexible enough let us drop off our luggage when we arrived well before the 2pm check-in time. Some of the advertised amenities were understocked, but that may have been due to our early arrival.
The room is pretty small - basically a kitchen with a bed. But we didn't spend much time in it to care. The bed could be bigger - for two adults, it was a squeeze.
The location is excellent. Victoria station is a great hub to quickly access the rest of the city. Pimlico has plenty of grub spots, and a Sainsbury's to pick up groceries. We were able to cook our own breakfasts, pack most lunches, and cook a few dinners since the flat comes with pots/pans/utensils (saved some $$ in expensive London).