The trip was great, we had a lot of fun in Malta. Rosanne's apartment is quite spacious and had everything we needed - except charcoal for the grill. In March it was quite chilly in the evenings and the apartment was a bit damp overall. The clothes in the closets got a bit smelly... There's no central heating and one would need to pay for AC not to be cold before the season - not that nice.
Marsaskala surprised us a bit with buldings needing renovation and dirty streets. But you can get a bus from there to go to Valetta and other nicer places :) Bolt also was very useful.
Overall a good place to stay keeping in mind you need to actually pay more to be comfortable and travel to different places to enjoy your stay.