I really enjoyed my stay in Justin's appartment and have already recommended it to friends.
It's located in a more residential area outside of the capital city, so it's a nice and quiet neighbourhood. I spent many evenings on the terrace, reading a book, overlooking the harbour. The ferry to Valletta is only a ten minutes walk away, and the service is very convenient: cheap, fast and just nice to be out on the water. There's also a bus station nearby, that connects you to the entire island.
The appartment is bright and modern, and has everything you need. For example, on my way there I realised I had forgotten wall outlet adapters, but there were plenty in the appartment.
Contact with Justin was very easy: he responded very quickly and was very friendly. He also provided an information guide, both online and printed out in the appartment, which was very helpful.