Tonio was very helpful, replied quickly and was so nice when we arrived at the appartment. There was some local bread, cookies, milk and jam for us, which was a lifesaver, as we arrived late. The apartment was perfect (and even had some extra adapters, as we forgot ours), clean, comfy and also located in a quiet area with a few restaurants (which were lovely!), near the fort and 200 meters from the small ferry which takes you to Valletta and all the sights (prize: 1,50 euro winter season, 2 euro high season.)
I really recommend to stay at this place!