What a great place to stay. I stayed for the best part of 3 weeks; its about a 10 minute walk from the archives and a 30-40 minute train ride from central London (train station 2-3 minute walk from Leigh's place). I'd unreservedly recommend Leigh's place to anybody coming to the archives and also those coming to London. Kew is beautiful with lots of nice walking and a few very good dining options (Antipodea my favourite) next to the station.