We had a lovely stay in Kirsty's apartment, and although we didn't meet her personally, she provided lots of useful information and was always available for questions.
The view from the roof terrace is terrific, and the entire apartment is spotless, well-appointed and full of character. The kitchen is equipped with everything you need to prepare breakfast or a light meal.
The apartment is on a quiet residential street away from the tourist streams, but still fairly central (with several bus lines and the ferry to Valletta in easy walking distance). Do note that it's on the third floor (or 4th floor US), with a fairly narrow staircase leading up -- not an issue for us, but perhaps for others.
We would definitely stay here again.