I had a great stay in Marsaskala! Christine's place was spacious, comfortable, and had the most beautiful terrace! Perfect for my work-cation. It was a little difficult to find her apartment using gps, but Christine provided very clear instructions, which helped a lot. She was very communicative and gave lots of great advice about traveling in Malta/restaurants in the area, etc.
I would recommend staying in Marsaskala if you want some place that is beautiful, quiet, and off the main tourist path. It's easy to get to around using the bus system and there are wonderful walking paths, beaches, and restaurants in this area.