Gyongyi's listing is a good option if you are looking for an affordable place that easily fits the needs of a family of four (or even five). Given its location, travelling into London will involve one or two bus rides before taking the tube/train. This is easily doable, but for our next stay in London, we'll probably again opt for a property closer to a railway station.
Gyongyi was very helpful before and on arrival and offered further support during our stay via email (which we appreciated, but didn't need).
There were some issues with cleanliness of the kitchen, but I understand this had to do with the cleaner being unavailable (at short notice) on the day of our arrival. As another reviewer has pointed out, the kitchen could be better equipped (pots and pans, a microwave oven, etc.).
The rooms were fine, and there is a nice little terrace/garden in the back of the house that we could have used if we hadn't spent all our time in London...
So on the whole, this was an enjoyable experience! Thank you, Gyongyi!