My partner and I stayed at Karen's place for 6 weeks from the end of January to early March for work.
We took the first week in Malta as a holiday and both Karen and Jeff couldn't have been more helpful, with lots of advice for where to go and where to eat while we settled in. We also took Jeff up on his offer of a tour around the southern coast of the island, which is a little more difficult to travel around than the major cities in the north. He was just so knowledgeable, sharing little tidbits about the island's history – it was great to get a local's insight on the island, and that only added to our experience.
We did find, like most places in Malta, the flat was prone to feeling a bit damp, so we had to keep on top of keeping the dehumidifier on, though I imagine this is an issue that solves itself in the warmer months. We also found ourselves missing a proper chopping knife, but we made do – the flat is otherwise really well-equipped and we had no trouble cooking most nights :)