Alfred (and his wife, Mary also) is a superhost, and I think I did not know the meaning of this word until now. They helped a lot all along from the booking until we left the apartment (they helped us to reserve a direct taxi from the airport to the apartment, to rent a car, etc).
The apartment is pretty good and the location as well (don't be affraid of some photos on the Google Maps, it is definitely different alive, much better). The flat is well equipped (during the booking, our main filters were: at least 3 bedrooms, good internet, washing machine, and all of these are OK in the reality). And the apartment is very spacious, all rooms are at least good enough (the 2 toilets are also a plus for a bigger family or company). The flat is only 7-8 minutes (by foot) from the Pretty Bay Beach which is also good enogh (for comparision, once we went to the Golden Bay on the other side of Malta and in my opinion, Pretty Bay Beach is better and much cleaner), but if you want to see pretty clear and amazing sea do not miss to go to St. Peter's Pool and Blue Grotto, both are 10-15 minutes by car or taxi from the apartment.
All in all, we did not regret to choose Birzebuggia and especially to choose Alfred and Mary's flat, so I strongly recommend the location and the apartment as well.