I've also visited Cartagena in Oct 2010, it's a nice city with lots to do. Although the beaches at the city are not that great it's very usable and you are very close to much nicer ones nearby.
It's a lot larger place than many cities in DR located by the sea so perhaps not quite an easy comparison. I would say the prices in touristy barrios are higher than DR touristy places, but again locals can always find cheaper hangouts.
Of course it goes without saying that you should go and stay in a place for a month or more before deciding on a long term plan.
I don't think you can get around the tourist visa limit like in DR (just paying fine on exit), might consider enrolling in a cheap college for student visa (not sure, or exit every few months - I love to know too, I might do a few months there myself soon).
Good luck.
It's a lot larger place than many cities in DR located by the sea so perhaps not quite an easy comparison. I would say the prices in touristy barrios are higher than DR touristy places, but again locals can always find cheaper hangouts.
Of course it goes without saying that you should go and stay in a place for a month or more before deciding on a long term plan.
I don't think you can get around the tourist visa limit like in DR (just paying fine on exit), might consider enrolling in a cheap college for student visa (not sure, or exit every few months - I love to know too, I might do a few months there myself soon).
Good luck.