We had a great time at Javier's place. The area is pretty local, not that many tourists (at least not in beginning of January), yet its not far from the central. Beaches within walking distance (not the best in Marbella, but totally decent), and restaurants and parks around. Near to mountain trails as well.
Javier replies superfast and is very helpful. I stayed in the apartment with two kids 4 and 8, and it was perfect. Calm surroundings, garden with pool, etc.
I would totally come back again, the area is very easy to feel at home in.