Someone gave me this advice when I was applying to uni/thinking about firming my top choices and it really helped me so I'm sharing it and my own advice from my own experiences in the hope it will help others!
It is a common myth that Optometry is an easy alternative to medicine, this is not necessarily true, it is an intense course (at Manchester anyway, I don't know about other unis) and requires lots of effort! There is a large work load and lots of hours (don't be expecting days off) but it is really interesting and the hard work will pay off!
Manchester is an amazing city, the night life is great, plenty of great cheap nights out and club nights aimed at students. As for accommodation, Fallowfield is great, it's full of students and is thought of as the party centre; lots of local bars etc.