This was AMAZING.
First of all, Jonas is sooo nice and welcoming. We met three times for coffee and birra, plus a little tour on the way, and had great conversations. He helped with all my needs. Cool guy that loves his city and also knows the world. I will most definitely talk to him before I'll visit Napoli again.
Second, The apartment is designed perfectly, for any use. It is very modern and yet has a character. Try to count how many references to Jonas's another beloved city are there around the place. I loved working and reading and cooking and chilling there, with an immidiate feeling of home.
It is near piazza Carlo III, which means it's easy to get everywhere without getting lost (the piazza is like a compass). There's a nice useful market down the street towards porta capuana. You are 10 minutes walk from the old town, but I don't think I even once walked there through the same set of streets. Every time I took a different turn and ended up walking through a new place.
The botanical garden is beautiful, but also take a walk up to capodimonte one day, via Riona Sanita (buy a birra on the way in Via Vergini), and see the big park there. Look for the fricking turtles in the little fountain/pond, they are the coolest dudes.