I have two Safe Houses (Lv. 3), you'll know it's mine because the interior is dark blue and looks dope AF. I'm also very fond of the the track "Meanwhile... Genova". One is between the Junk Dealer and Chiral Artists Studio. The other... well.. its on a mountain top south of the Evo-Devo Biologist just outside of the terrorist's territory (say that two times fast, lol). **Hint** There's a zipline network that gets you easy access to the mountain top.
If you're able to come across either, stop by... take a rest and drop a like (or 50). I'm working on keeping the shared lockers stacked with helpful things as well so be on the lookout my fellow porters!