Mary Anne and her family are excellent hosts. They are very gregarious and willing to involve you in happenings within the house (in my case it was an offer to watch the football championship).
The area is excellent - in the heart of Valletta with an amazing view on the city. The apartment and room you get to use, too, is cozy.
The only thing not communicated properly was having to pay a tiny land tax of 0.50 EUR per night, but it's a negligible number.
Overall, an excellent experience, great hosts, and excelsior room. I would drop by just to say hello even if I don't get to stay at Mary Anne's the next time I stay in Malta.