I have 70 left. A lot of apps I could just delete, but I have them there because I don't need the space. I'd be at around 62GB if I downloaded the Apple Music tracks for offline listening. I had them, but they deleted themselves and I never bothered to redownload them. I think I cannot use much more than this. On my 128 iPhone 6s, I have 71 left, but with a 2-hour-1080p-60fps video that takes a little over 19GB.