I stayed here with my parents - first off, we were so thankful to be staying in Birgu as opposed to Valletta. After exploring both cities, we much preferred Birgu. There are wonderful museums nearby, the harbor is a short walk away, and it's far removed from the tourist insanity that infests Valletta.
The apartment itself is very well appointed, clean, and stylish. The host and his mother met us in person during check-in to show us the space and answer any questions. We were more than comfortable. The house is huge and could easily accommodate a large group. Only word to the wise - you must be comfortable using stairs, as the living spaces are spread out over three floors.