The location was fantastic, the space was convenient, Mischa was responsive to our inquiries, and we had an absolutely wonderful time staying here.
First things first: fantastic location. It's a 10 minute walk from Victoria station, and a 2 minute walk from the Pimlico tube stop, so getting anywhere in the city was convenient. The neighborhood was great too, despite not having enough days to fully explore. There's a few small grocery/markets nearby for the odds and ends we needed, and we particularly enjoyed a pub a street over called CASK that we went to a few nights - it was lively and wonderful. We also tried a restaurant a few blocks down called Grumbles that I quite liked as well.
Next, the space. There are two bedrooms, the toilet, and the shower on the first half-floor, a bedroom and the very spacious kitchen on the next half-floor, then the living room on the last half-floor, then the rooftop terrace. The beds were all comfortable and I couldn't hear my mother snoring in the adjacent room, which is a priceless feature. Our trip overlapped a wintry spell, unfortunately, so we didn't make use of the rooftop terrace as much as we'd hoped, but it was a nice view all the same. The heating in the flat was very good, everyone was quite comfortable. Everything was immaculately clean upon check-in.
Lastly, our hosts. We had a positive experience with them before before and after we arrived, and will definitely look to stay at their place again if we return with as many people next time. Due to some travel delays, we arrived significantly later than expected, so it was fortuitous that the hosts have a system set up for guests to fetch their own key so we didn't have to keep anyone waiting.
I gave this place the highest number of stars in every available metric, but its highest honor is that my mother, who constantly criticizes everything and everyone, was vocally impressed by how nice the flat was and well our stay went.