We stayed in this apartment for a week in February. We stayed as a couple, but there's plenty of room for 4, with 2 good bedrooms and bathrooms. It's a clean, comfortable flat and in a very good location from which to explore Malta. 10 minutes pleasant walk gets you into Valletta proper, and a little less than that to the central bus station, from where you can pick up buses to all island locations. You can also reach the nearer bus stops within 5 minutes walk. I wouldn't recommend hiring a car, as the driving seems chaotic to the visitor, and the bus service is pretty good, fun and very cheap.
Floriana itself is a quiet, mainly residential area, and has a selection of quirky local shops, where they manage to cram everything you can want into a very small space, at reasonable prices. Right outside the flat you can look down onto the whole Valletta dock area - always something to see. We even got a little February sunshine to sit on a bench, have a drink and watch things!
The owners are extremely helpful and friendly, and the flat is stocked with a comprehensive range of tourist information about Malta and Gozo. We even got picked up at the airport and driven to the flat. Communication prior to the holiday was good.
We thoroughly recommend this property.