The proximity to Hyde Park makes cycling feasible from a range of places. DD planned to cycle through various Royal parks to get there from Central London.
London is an incredibly easy to access by public transport. I am always a bit 🙄at suggestions that North Acton to South Kensington is a difficult journey. DD, who had previously commuted 40 minutes to school in Hammersmith, was initially shocked by the infrequency of Bristol's public transport. Her London bus had run every three minutes.
Native Londoners often prefer the bus or walk. I regularly clock up 15,000 steps without thinking. The range of hire bikes add an additional dimension, so DD used a Boris Bike to meet friends to take the train to Imperial's sports ground. I suspect it is a different mind set, and perhaps a shock to those used to driving. (It is astonishing how few of DDs London peers can drive.) And unlike some other Universities, social activities tend to be centred around campus, the SU bar or in societies.
She also does not go out to pubs and clubs but socialises in friends flats or looks for free things to do. also rings true. Our experience was that London teenagers would meet up in art galleries (really!) or parks or gather in groups to watch films in each other's houses. The Bristol clubbing culture was very different. A keen scientist will enjoy the availability of free lectures from various Royal societies, whilst there are endless free music and other arts events, and cheap theatre and comedy tickets via various apps.
Some international students are very rich, but not all. An Imperial degree offers status but also security, and family members will club together to send a bright kid abroad. Some students used to prefer London because of the ready availability of casual work eg cleaning, though now tutoring is popular, and Imperial students preferred.