We stayed at Zak's apartment for one week. It's perfectly located to explore Valletta and you can get to the ferries to Sliema, Three Cities and Gozo in walking distance as well as to the bus terminal for trips anywhere else on Malta. Well equipped, perfect place for 2 people. Communication was very friendly and supportive.
You need to be aware that the apartment is above a street with a lot of traffic in the morning and evening so expect quite some noise.