My girlfriend and me stayed here for a week in September. We absolutely loved this place - it's even better than advertised! The view from the terrace is mind-blowing in the evening! There are two stores within a walking distance, and I mean it - The Convenience Store is at the end of the other row of houses. The neighborhood is quiet and peaceful, you can stay away from the noise of St. Julian's. And if you're lucky, you might even see fireworks from the bedroom!
Isabel is a superb host - she really wants your stay to be as perfect as possible. There's a helpful guide written by her in the apartment that got us started on the right foot.
So, if you wanna visit Malta, book Isabel's, get your 7 days' bus ticket at the airport, and experience the island! The bus stops right in front of the apartment (the stop is called Luigi) and there's another stop nearby called Xwieki - we mostly used those two to travel around the island.
(tip for the light sleepers: bring your earplugs if you don't want to be disturbed in the morning by the roosters across the street)