Great location and lovely host! Rosella welcomed us very warmly and offered good tips on what to do, where to go for activities and local food/restaurants.
The apartment is spacious, well laid out and comfortable with good cooking facilities.
Sliema was a very good town to stay in. There are things to see and do there. There's parking, so good if renting a car. Other interesting towns such as Valletta, the Three Cities and Mdina are easily accessible from there.
I highly recommend Rosella's place. I would definitely go back given the opportunity.