Mark's flat is ideally located: a few meters away from Saint Julian's night life and very quiet a the same time. We rent a scooter during our stay and it was very safe to let it outside the appartement.
It was very clean as well with AC (which is amazing regarding the heat outside). All the equipement were available in the kitchen and towels for the bathroom (the lack of soap was problematic for the first night though).
The only negative point of the appartment is the small terrasse, without any view, stucked between 4 walls.
Communication was great with Mark, and he kindly organized our arrival and derparture with a taxi and he took care of our suitcases the last day (our flight was at night and he wanted us out of the appartment at 11:30).
I would recommend its place for couples who want to stay at a hot spot of the island.