Not alot goes on in Stonehouse, it's an extension of nearby Stroud which is pretty much full of hippies and 'care in the community' types. Avoid living/going for nights out there if possible.

For £550 a month you might struggle to get a decent one bed apartment in Cheltenham or Bristol, you're money will go further in Gloucester. You can get a pretty decent apartment on the docks for that sort of money, only draw back is it's not a great a night out.