We had a very good time in Birgu. Unfortunately we didn't get to know Lisa, but Billie was a very friendly and helpful.
The room was very nice, simple and spacious, the private bath almost as big. We didn't miss anything. It can get pretty stuffy in there, but then: We travelled in August - not a very smart move anyway, probably. And you can pay extra for aircon, which we didn't.
The best thing was the location, though. Birgu ist really pretty and the house is in walking distance to the main square, the ferry and the bus stop, and yet, it's quiet. (Well, except for the fireworks that the Maltese are seemingly obsessed with.)