We stayed for 3 nights in Tonio's apartment and found it to be a perfect location for visiting Valletta and the area. Best of all,the water taxi at €2 per person is literally across the road. In a few minutes, you are are across the harbour, landing next to the Gozo fast ferry terminal.
There are plenty of restaurants in Birgu, one night we walked round to Senglea to eat, another on the waterside and the third night up into Birgu. No need for a car at all, we also travelled to Mdina by bus from the square above the apartment.
As a group of 3 adults, we had plenty of space and comfortable beds, suitable for 4 people. Situated above a couple of cafes and overlooking a road, there is some inevitable background noise. However, although I am a bad sleeper, I had no trouble sleeping, thanks to a fan! I would recommend this flat for a short stay, Tonio was kind and very helpful, he kept in touch with us and helped with a restaurant the first night. Very convenient, about a 20 minute taxi ride from the airport to arrive at a marina side apartment .