I've passed Stage 3 (and all that came before it) and my medical - just waiting to start now (July).
The B&Bs don't seem to be as bad as they might sound (although ask those who already live in them maybe!) - they're usually wholly let out to TATCOs so it's not like being in a hotel or normal B&B. You get use of kitchen and living room etc so just like a big house.
There's plenty of rental stuff that people are willing to share, but signing contracts is a difficult issue as there's no guarantee that you'll be in Bournemouth for 6 months (due to various potential course-related issues).
Overall the best recommendations I've had are to live with other TATCOs so you can study together, and if you don't have a car, aim for where there's lots of people who do!