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.
2011 BMW 550i M-Sport (Jet Black/Cinnamon Brown) - 4/30/14 (Current)
2007 BMW 328xi e92 (Jet Black/Coral Red) - PAST
2005 Infiniti G35 Coupe (Ivory White/Stone) - PAST
2005 Acura TSX (Obsidian Black/Black) - PAST
1998 Acura Integra (Black/Black) - PAST