I can only recommend staying at Francos appartement because of the following reasons:
1)Communication: Franco wrote back very fast and sent us 1 month before we arrived all the important informagion we needed also for tourist attractions, which helped us a lot.
2)The service: Franco organized us a taxi from the airport to te flat for 18€ and the driver also had the key for the appartement. This worked perfectly and you dont loose time searching for the correct bus. Plus you talk to the driver book the taxi directly for the way back to the airport.
3)The flat:
The flat was very cleaned, had ecerything which is described in the description and he even left us some small welcome gifts. The flat is on top in the centre of valletta and very big. And I can just point out again: very clean.
So all in all we enjoyed the week which we stayed there a lot and I would book this airbnb flat again the next time I fly to malta. :)