I stayed at Andre's place in Valletta in November 2018 for two nights.
The location is perfect. It's just two blocks off the water near where the ferry to Sliema leaves. And it's just three blocks (uphill) from the main drag. The area is quiet at night, which is good because the sounds of the street come right into the townhouse. This only affects you if you try to sleep in.
The place is as pictured. It's an townhouse in the old part of the city, so expect it to be a bit quirky. But everything works and the finishes are modern. The rooftop terrace is great, but it will take a commitment to get up there. It's a 3-4 story climb up a spiral staircase. It's worth the climb as it's a peaceful look above the city.
Check in and communication were fantastic. He replied to my messages within minutes.
I definitely recommend staying at his house and in Valletta.