Marsaxlokk is a beautiful little fishing villlage with lots of restaurants and beautiful little fishing boats in it's lovely harbour. However, if you're planning on spending you holidays at the beach and you're not willing to rent a car or a scooter, I wouldn't recommend choosing Marsaxlokk as your holiday home. We didn't like the local beach at all as it is really close to a big industrial harbour and right on the opposite side of a hughe gas tanker and a gas-fired power plant. You can also travel Malta by bus, it will cost you 2€ per ride but you better calculate enough time and don't stay out too long as the evening busses might not come after all and you might end up stuck in the of nowhere at night.
As a beach alternative we really enjoyed St Peter's Bay which you can reach via boat from Marsaxlokk's harbour for 10€ both ways.
Anthony's airbnb apartment is a typical Maltese home with lots of stairs so if you're old, habdicapped or lazy, I wouldn't recommend this place either. For us it was a good choice anyway, we liked the interieur of the place and it's beautiful rooftop view. The fact that the restroom was open and right inside of the bedroom freaked us out a little and a big minus is the rather outdated kitchen equipment. We chose the airbnb partly because it was supposed to have a proper kitchen, however the stove and the oven didn't heat enough so it took us more than half an hour to only cook a coffee with our Bialetti.
What really did bother us was the construction workers in the house next door who started their work every morning not later than 7-8am. Even on sunday we were woken up by their noise at 7am. Furthermore their construction waste and dust always covered our rooftop terrace.
In general I'd sah Marsaxlokk is worth a visit if you're looking for a typical Maltesan place. We enjoyed our stay at Anthony's place as well but I'd say it is a little overpriced for what it actually offers.