Our stay at Marc's place was wonderful. We stayed for almost a week. The first thing that struck us was how close it is to the beach. It is literally half a block from cliffs that overlook the water. With care, you can walk the single-track path down to a trail at the water's edge. It is also a 0.5 mile walk to the main drag of Ocean Beach, with a bunch of restaurants and bars. It is also close to Dog Beach and about 25 min to La Jolla. Marc was very responsive to any questions that we had, and check-in was a breeze.
The apartment has anything you would need for a vacation stay or work--we both worked from the apartment for two days while we were there with no wifi issues. The apartment itself was spacious and felt even bigger than it looked in the pictures. Everything was newly renovated and in great condition (fridge, dishwasher, washer/dryer). There were several nice touches as well, including snacks and beach towels for our stay. The king-sized bed in the master suite was very comfortable. The couch is oversized and very comfy--a plus for an airbnb! Also, all of the TVs are huge. Finally, the grill and outdoor fireplace both worked great.
One thing to note is that most places by the beach in this location are under the flight path for San Diego airport, if you're sensitive to this type of thing. If you're a light sleeper, you might want to bring earplugs. On the plus side, the blackout curtains worked great. Would happily stay again!