The apartman is so huge and super clean, it was amazing for 4 people, it is bigger than on the pictures. The kitchen is very well equipped, air condition in every room, balcony in every room, enough space for clothes and everything. The apartman is brand new. If you travel in winter, one balcony door doesn't close properly and warm water runs a little bit slower, but these are small things.
About location: bus stations are close, it is 20 mins from Valletta, 45 on foot. Shopping malls are close, two grocery shops just in front of you, loads of restaurants there.
Decide which part of the island you would like to discover, which do you prefer, than go close, because bus is quite long anywhere, cars are in jam often.
Paola and her colleagues answer very quick and they are really flexible and helpful. So thanks for everything! :)