I didn't have the chance to meet Anne Marie, but she kindly answered all my question and was very helpful. Her parents picked me up at the airport and drove me back on the last day, which was very convenient.
I stayed in another house as the one advertised here. It was located in the same street and was quite big - maybe a bit too big for one person. It had all what you need for a week stay and was well equipped (also with electric adapters). The house is located in a quieter street, but it was still at reasonable walking distance from the Sliemma Ferries and St Julian. My complaints would be about the bathroom that could have been cleaner (there were still hairs in the sink, the mirror was dirty) and there was no curtain around the shower to prevent the floor from being full of water. And the bed was a bit too loud.