Like others have said, Nava is the queen of landladies - warm and attentive but never intrusive. She made sure that our stay, with two 10 year old boys, was as comfortable and enjoyable as possible.
The living room in the pictures looks more long and narrow than what it really is, which is squarish. That said, the apartment is spacious for four.
We were two families, each a mom and a child, and we enjoyed great privacy because the living room + bed and the bedroom can be closed off from one another completely, with the bathroom in the middle.
We used the handy kitchen every day, making big breakfasts, sandwiches to take with us, and sometimes light suppers like pasta & salad. The kitchen is complete with everthing you might need for making and serving meals.
We also found the washing machine extremely useful because we could travel more lightly and simply wash an entire set of clothes to use again.
We slept very well on the beds.
The neighborhood is brilliant. You are 5 houses down from Hyde Park and literally across the street from Kensington Palace & Gardens. It's a very elegant and safe area, with many embassies and fine hotels. Bus lines that take you all over the city are 1 minute away and the Tube station with the very useful "Circle" line is a 5 minute walk. We enjoyed eating at a couple of restaurants very close by -- Wagamame (Asian fusion) and Bill Wyman's Sticky Fingers (burgers and ribs) that Nava directed us to. Yummy. We also shopped at the local grocery stores -- Tessco (cheaper) and Whole Foods (fancy and expensive). The gourmet food store of Marks and Spencer's is also close by, on the way to the Tube station.
I heartily recommend this property and will take this opportunity to say "Thank you Nava!!!"