Let me start by saying that the Host is very friendly, communication was great as well as check-in/out (by code), so you don't have to worry about that. In the flat we found some treats and many leaflets, guides about Malta/Valetta.
The flat is not big, rather not bright (only one window for the dining-sleeping space) but sufficient for two people who prefer to spend time outside and come back only for night's rest. However you should bear in mind that there is a street with a bus stop next to the entrance to the dwelling, so in the morning you can hear cars driving and people talking.