The place is a basement, but there's a patio providing plenty of light in the living room/kitchen. It didn't feel like basement at all.
If you don't intend to say at Zone 1, the location is as good as it gets: Westfield shopping center is across the street, and you have Hammersmith and City/Circle line and Shepherd's Bush stations at walking distance. Moving across London was never an issue for us.
The place provides everything you might need for a seamless stay: plenty of towels and sheets, and pretty much everything necessary if you want to cook at the apartment. The bedrooms are small but comfortable anyway, and the two bathrooms are nice. Also there are cool details such as a few sockets with EU format, so you don't need EU/UK adapters unless you intend to charge more than three phones simultaneously.
Overall, my family and I liked the place and would stay there again. Recommended place to stay at London's Zone 2.