Simon's flat in Silema is maybe a 10 minute walk from the Silema Ferry. There are buses into Valetta only a 4 min walk from the flat.
The flat is large and clean. It is situated close to Simon's bar, as well as a few others that are nearby and that could get a bit noisey for one of the rooms, but ear plugs help with that.
A lot of buses go from Valetta, so be prepared to take a 20 minute bus to the main terminal, or just hire a car which will probably turn out to be easier.
Simon is a great host and was very helpful in arranging a taxi to pick us up from the airport.