Aleksander's London flat can be summed up in one word - fantastic! The 2 of us stayed at the flat for 2 weeks, and it was everything we could have hoped for. It was roomy, and incredibly well equipped, with a top notch full kitchen, plentiful hotel-quality towels and linens, and a fridge and pantry stocked with vegan, gluten-free food and drink (our particular diet requirement). (We have never had an AirBnb host stock the fridge!). In addition, the flat came with a smart phone (again, a first for us with an AriBnb host) which made navigating around the city and getting in touch with our friends there a breeze. The flat also has a very private rooftop patio which was very nice for having a drink at the end of a busy day in the city.
The location of the flat is superb - just on the west side of Westminster (in Pimlico). It's within walking distance or a short tube ride to most of the major attractions, yet is located on a very quiet street. The nearest tube station was just 0.2 miles away, just a short walk. This makes a big difference, as you are making a lot of trips to and from the tube station over the course of a stay, and a long walk to the tube can put a lot of extra miles on your legs.

Aleksander was out of town while we stayed, but we never had any problem getting in touch with him with a question. He was very responsive, and even had the housecleaner go out and get some extra paper for the house printer for us one day. Also, because we were there for 2 weeks, the housecleaner came by halfway through our stay and cleaned up and gave us fresh towels (no extra charge!)
Aleksander was easily the best AirBnb host we have experienced, and we can't wait to return to London and stay in his flat again...