We stayed in the apartment for 6 nights, 2 adults and 2 young children (3 and 5). Our children shared the second double bed and we put some chairs around to make sure they won't fall down as the bed is relatively high. The appartement was clean, modern and already had some basic stuff like dishwasher tabs and coffee capsules for the week that were convenient.
Two supermarkets in the neighbourhood, many tube stations and a park!
Main issue was Wifi that didn't work well since it's not dedicated to the apartment. You have to go through a login page that doesn't always work and you must stay in the kitchen! The owner gave me a discount for this issue but that was very annoying on a daily basis as I had to connect for work and kitchen it not the best place with kids.
Other lowlight is that rooms are very noisy (buses and cars) and not dark enough.
Be prepared to bring earplugs and sleeping masks if you want to sleep well.
I was hesitating to give 3-stars but given the discount I had on Wifi and overall great stay in London I would finally rate 4-stars.