The flat is away from the main tourist attractions, which makes it authentic. We loved the roof top and watching the ships coming in and leaving the harbor, always exciting to see how they maneuver. The street is very quiet and although you have all commodities around, it's really peaceful and relaxing. If you look for something different than the tourist track, it would be perfect for you. We had a few nice walks in the country side towards Marsaxlokk (North) and towards the sea and cliffs (South). A very good point was finding a car park, no issues in that area, when you have a rental car, which might be challenging in other parts of town.
The next attraction is Ghar Dalam Cave and Borg-in-Nadur, walking distance.
All and all I would without doubts recommend Victoria's house, she was very helpful and cared a lot. We even got a little gift on our arrival, as we came on December 25th. Be aware that houses in Malta can be a little chilly in winter, like in any other housing in Mediterranean .