Hello! Welcome to London in advance! I'll try and answer some of your questions :)
- The transport links in London are really good (buses, tube and the tram in South London), especially if you want to cycle around! If you're used to city riding I don't think London's particularly scary. Loads of people cycle now and it feels like cycle lanes and superhighways are cropping up everywhere. Just make sure you have a good lock!
- You have a really good budget so I'm sure you won't struggle to find somewhere to live. It's pretty difficult to find somewhere for less than £400 a month to rent, and that would definitely be in a house share, probably in a not so great area. You could look at some student specific accommodation blocks - they're expensive but the price is normally all-inclusive of bills etc. and you can stay their short-term (ie. you wouldn't have to commit to rent for 12months). There are some places around the Chancery Lane/Holborn area where you're studying but they are realllly expensive, £339 a week! https://www.unite-students.com/london/kirby-street
- If you're not into that idea, http://www.spareroom.co.uk
and Gumtree are good for finding houses/flats with spare rooms going. I am biased towards South London but you could look around the Southwark/Waterloo/Elephant and Castle area which would be a really easy commute by bike, bus or tube to where you're studying. Brixton and Camberwell are a bit further south but pretty 'cool' areas that will most likely be cheaper. If you want to live alone it will probably be easier to find somewhere in your budget in those areas. You could also see if your institution has an accommodation office that could help you find somewhere? Coincidentally, Ms Cupcake, a vegan bakery in Brixton (http://www.mscupcake.co.uk/category/vacancies/
) is also looking for cake decorators so maybe you could contact them!
- Re: yoga, google definitely knows more than me. If you want to join a cycling club/ride at the outdoor velodrome in Herne Hill though hit me up though!
Hope that helps