You can tell this is an architect's office, as the building has been beautifully restored, to a very high fit & finish. You can tell that they spent a LOT of money restoring it. There are numerous quirky design features, which I really enjoyed.
It's only 3 studios, sharing two large rooftop terraces, so as other reviews point out, you have this space to yourself most of the time. I met 4 other residents, who were all charming, and happy to have a chat over a glass of wine on the terrace. Views from the terrace are incredible - 360o view of the harbour on both sides. It's right next to St Elmo Fort, and the bay window has good views. WiFi worked great, in the room and on the rooftop.
The centre of Valletta is just up the hill, maybe a 5 minute walk, with numerous good, reasonably-priced restaurants & cafes.
This accommodation suited me perfectly, and I highly recommend it! Almost like a boutique hotel really, with excellent, rapid responses from msgs on Airbnb. Comfortable bed.