We stayed at this place with the four of us. (2 adults and 2 kids) The place is clean, close to the Underground and the pictures on the site are accurate on what you get. The host asked us how our day was. You get a private bathroom and kitchen, and two separate bedrooms (1 double bed, 1 double bed and a single bed)
We did have a bit of a situation in the beginning because the host expected one child, when we booked for two kids on Airbnb. Because of this we had a bit of a confrontation where I had to proof I booked for four, then we were asked if we could pay more because she had to turn down her friend for staying. This made us all feel very uncomfortable and unpleasant, even though the rooms itself were good places to sleep in. Because of the confrontation the kids felt unsafe and wanted to leave - but last minute bookings elsewhere were too expensive to do so. The host was also very loud at night with shouting. It's a pity this happened to us, because other than this experience I would recommend this place for it's accuracy, cleanliness and utilities. But I do want to address this issue on the site to double check if your booking is correct, especially traveling with kids.