The Sheraton is out of the way, and the beach is rocky.

Copa is not the best area generally to stay and walk around, especially at night. Ipanema is enjoyable all the time, and has all kinds of local restaurants. It is somewhat European. I personally though Copa was more like Mexico, but other I know will differ. The Sofitel is good to stay in while in Copa. It is at the end of the beach near the fort and almost in Ipanema. The Golden Tulip Ipanema Palace was fine in Ipanema.