We had a lovely stay at Andrew's apartment. Him and his mum were great hosts and helped us with all our problems. We didn't have hot water the first 2 days but Andrew and his family tried to fix it as soon as possible.
The loft is really nice. Only downside is that the bedroom is in the basement and therefore very humid. Overall we enjoyed Malta very much and the apartment is great to explore Valletta and the rest of the island.
Ps: Trip to Blue Grotto is definitly worth it!