Hi Carol,
I was just wondering last night when you were going to get another octopus!
The accounts I've read of people keeping O.vulgaris have been very positive. In fact, people become very attached to them and they live longer than bimacs (maybe a year and a half). The only negative is that they do try to escape and they eat a lot.
I think you should take it, but plan to get a large aquarium. Some time ago on another website I read an account of a family in Florida who had found a vulgaris. They brought it home and and took care of it until it was outgrowing its large tank. Then they carried it back by car to the sea in a cooler (!) - it was a long trip, some hours, and the whole family was crying for the entire trip because they loved their octo so much.
If you do decide to donate it, maybe you should check in advance to make sure they'll take your vulgaris.
It will evenually have an 8" inch body with arms over 30".
Nancy