Excellent location. Daniela and Carina were very helpful and always responded promptly to any queries. The flat was incredibly hot when we first arrived but the air conditioning works well - one of us even woke up cold in the middle of the night, which wasn't something we had expected upon arrival.
The flat is ideal for outdoor dinners because of its massive terrace. It's situated in quiet Senglea, a short (and cheap) ferry ride from Valletta. Highly recommend.