We stayed in a private room in a villa. It is shared by many other dwellers but other than queues to shared amenities we didn't experience any noise or annoyance you would expect from a hostel.
Location was great, 10 minutes walk from Golders Green metro stop and has good connectivity by bus as well. There is a beautiful garden in the backyard and a park nearby.
The room had 2 beds which can easily accommodate 4 people, though we were just 2. Room was right next to shared kitchen but people were considerate and didn't disturb during sleeping hours.
It had kitchen with all amenities but the fridge was stacked to its gills almost all the days. There is a washing machine and drier but again be mindful that it may be in use all the time.
Overall, its a good value for your money for your stay in London. I would recommend it wholeheartedly.