Me and my gf stayed over at John's for 5 days.
The location is really good, walking distance from Valletta (25 mins or so, 5 mins by bus). John even has his own "bible" which you can use during your stay in Malta, this bible contains some amazing tips and recommendations on things to do in the area, places to eat, etc. I found that to be a nice little detail.
In our last night in Malta we shared a glass of wine with John in the rooftop, which by the way has some really nice views over the city, we had a nice chat and that felt like a good way to end our trip.
I can recommend John's place for when you're in Malta, you won't be disappointed.
Thanks for everything!