Pros : Good location, just near Kensington Park / Kensington Palace. 2 tube stations nearby, next to buses. 15 min walk to Notting Hill. Plenty of supermarkets and restaurants (some excellent) nearby. Very clean. Has everything for a week-long stay (but space). Friendly and helpful staff. Fully-equipped kitchen (fridge / freeze drawer, washing machine, dish washer). No regrets whatsoever. Great place to stay. Houses two on vacation. Would definitively house one person even for an extended stay (for instance work-related). Recommend it warmly !
(Tiny) Cons : Quite tiny. Bed maybe on the soft side, not large. Bathroom & shower really really tiny. Rain shower, but no hand shower. You wouldn't want to stay indoors too long (if not on your own). But all this pretty much made up by the plus sides.