Very quiet in Jan with a lot of things closed, I had difficulty exchanging money banks refused unless you had an account with them and only say too exchange shops down at marina so you need a cashpoint card.
Lots of steep hills and walking for elderly/disabled travellers, recommend you hire a car to get the best of the region/area.
Benalmadena has a great marina with lots of restaurants and shops, the beach is very big and walking around the town is pleasant.
nice beach location. many day trips available. cable cars up to mountain. good resturants; try the spainish gardens.