I lived in central, v central London. My closest big supermarket was Waitrose underneath JL on Oxford street.
I loved the convenience of meeting up with friends, no long tube journeys back home, being able to walk to so many places, I used the bus and lime bikes loads.
The noise of idiot boy racers with loud exhausts was a nightmare. It was every night, for hours and hours, 365 days of the year.
London never, ever stops. 3am, there are people out and about, Xmas day, loads of people, I jen you're trying to get to the shop for milk, people standing in the way.
Would I do it again, no but I liked it when I was there. I saw some amazing things and met so many people. Many many films were shot within a few meters of my place. I went outside on set many times at 1am and chatted to crew / cast.
I met some A list actors by simply being polite and 'acting' as if I belonged there and was part of the crew. I went to some amazing restaurants, explored areas that I hadn't been to before (despite living in London for years), went to West end shows, galleries, exhibitions each weekend.
It was great and I'm glad I had the opportunity but in the end, I found it tiring and just too much. You will have great fun I'm sure, make the most of it.