We came to Malta with absolutely nothing in mind, we took this place as it looked nice and the reviews were very positive.
First the location is ideal, really. It is quiet but very close to the bus terminal and ferry to Valletta (5 minutes walking if you take your time). And it is very well placed in Sliema, you can get to very good restaurants by walking between 5 and 10 minutes.
The flat itself is brilliant. It was shiny clean, very quiet and very well made. You have everything you need, we made lunch and diner a bunch of times there during our trip, kitchen is well equipped and you have a supermarket something like 10 minutes walking.
Now the host is something that you can't even dream of. Ugne is a very very nice and helpful person. I can't say this enough. She did indicate nice stuff to see and go, all of them were fantastic.
If you are to go to Malta stay at Ugne's. you can't be wrong.