The neighborhood was close to the British National Archive, and that was the point for me. But Kew is quite nice, as is Richmond. There is a good Nepalese restaurant just a step away (Rara) and I hear that the place under the apartment (Curry garden) is terrific although it was closed for now. There was street noise in the morning on one day but I think that was more of a contingent issue.
I didn't hang out in the apartment much. The room, while sparse, was clean. The wifi worked. My only complaint is that the bed was not particularly comfortable.
I was staying in Kew to conduct research -- I wouldn't necessarily recommend to somebody who was going to sightsee in central London every day as it is a 30-45 minute commute.