Mark is a great host. As we arrived in Rabat and didn't manage to find his place (which is, actually, not so hard to find), he sent his wife to pick us up.
The apartment is, indeed, very well located, a few minutes walk away from both the centers of Rabat and Mdina. It is newly refurbished, very clean and spacious even though it had, during our one night stay, no air conditioning and few water pressure. Nothing terrible, though...