We stayed here with our (just turned 3) 3 year old for 5 nights.
Location: Senglea is a quiet section of the island with great people and good restaurants nearby. 10 minutes to Valletta by ferry which runs every 30 minutes - you need to get to Valletta to go most places and the ferry is the fastest route. There are also water taxis (smaller boats) that will ferry you across. Taxi to the apartment costs between 15-20 euros from the airport.
Apartment: Place is as shown in the pictures and very comfortable. It is on a quiet street although there were some road works happening during our stay but it didn’t bother us because the bedrooms face the other way. You need to climb 3 flights of stairs to get to the apartment but this was not difficult even for our 2 year old son. The apartment is well maintained and very clean with all amenities. We didn’t miss a single thing and we’re a bit spoiled from living in the US.
The host: Simon takes care of everything and responds very quickly. He is a terrific host.
He arranged for a toddler bed which was the right size for our son. The added touch was complimentary fruit, croissants etc. and a nice bottle of wine that we enjoyed.