Ali's place is truly a hidden gem in Istanbul. It's right next to Istiklal Street which is a really chick place full of nice delicacies and shops which don't feel like a tourist trap (unlike those on the Old Town side). The place itself is a whole basement level with backyard garden, so it doesn't feel like a basement at all. Decoration is artistic and there are lots of sofa and seats it feels a loft that you can hang out with friends. Also there are everything you need for a long stay: washing machine, full kitchen, dish washing machine, even the steaming room! One caveat is that the street is on really high slope (near Galata tower) so if you have problem with climbing it might not suit you (not that far a walk anyway since it's quite close to subway). Other than that I'd really recommend Ali's place for anyone seeking a good stay in Istanbul!