Accom for 3 month internship

Hey, I'm Isaac, I'm a 26-year-old genetics PhD student at Oxford looking for accommodation in London while I'm doing a 3-month internship here (roughly 15th April to 16th July).

I'm after a double bed within <45 min commute of Mayfair, so pretty much anywhere near a tube line that runs by central would be ideal. Would be great to live with people around my age, but open to all ultimately.

I'll be working in the office 9-5 weekdays, so I'd normally only be around on the evenings/weekends. I'm somewhere on the middle of the introvert/extrovert scale - equally down for a quiet place to lay my head, as I am to be up for going out. Outside of work, I'm a keen climber/cyclist and performer/fan of classical music.