Personally, I would not want to park my car in Allston/Brighton. Your insurance will go up alot, higher chance of breakins and dents/bumps/etc.
If you want to live closer to the city, then maybe you would consider living in Watertown, closer to the Cambridge line. I used to live near the Lexus of Watertown and I had easy access to Storrow Drive and it was 10 minutes to get into the city. Plus, you have some bars in Watertown to go too and the insurance is not as costly. Just something to consider.
2007 e92 328xi (Jet Black)