It does have an ensuite in the attic, although it looks like a wet-room and they're a bit of a mare unless huge.
It really depends on who's living there I think. If you're a single parent with one child it could work really well if teenager takes attic bedroom, you take one of the lowers, and the third bedroom becomes a snug second sitting room with a desk (ie designed to be used as living space away from the open plan bit).
And also, do you live a very city lifestyle - lots of going out in the evening to eat, with everything else consisting of posh ready meals or salads, more or less? If so the kitchen would be fine. If you like to have friends round every weekend for elaborate lunches or dinners, less so.
I mention single parent-ness because I think two big grownups would find any of those bedrooms a squeeze both physically and in terms of storage space.
I think if i've described you above, the joy of living in Little Venice and all its loveliness, and of being so central, and the views across London, and the feeling of being a sophisticated urbanite 😉would outweigh the downsides of the overdeveloped space.