My friend and I stayed in this apartment for 4 nights and would really recommend. It is sparking clean, very comfortable and spacious in a central location just minutes from all the main sites. Umberto is really friendly, quick to reply and very helpful. We were given a map of Valletta and Malta and told where all the best places and restaurants are.
The only thing is that the central square which the apartment overlooks can be a bit noisy first thing in the morning as the cafes and restaurants start moving chairs and vans are presumably making deliveries. We did get used to it and I would still very much recommend this lovely apartment just take earplugs if you are a light sleeper.