Maria and her husband are very nice and friendly people, striving to make us feel comfortable. Nevertheless, the apartment was rather a disappointment for me and my friend. We stayed there for a week in February, and it was extremely cold inside. Happily, we had a heater in the room, but it seemed to be quite dangerous with the gas, and, it was still cold in common areas, especially in the bathroom.
Also, we were unfortunate to meet the troubles with the water and electricity, and there were constant troubles around something in the apartment during the whole week. This made us feel a bit stressed and did not let us feel 100% comfortable and relaxed as we would expect it on the holiday.
Hovewer, the apartment is bright and spaciuos, the area is very central and close to the main bus stop, in a walking distance to Sliema and Valetta.
I would probably recommend this choice in summer, and also hope that for other travelers the stay will be much more smooth than it did for us. :)