My prospective (it was my first location upon joining the AF)...Frankfurt has a great Metro...used to be utterly safe (won’t say that today)...and the Sachsenhausen district used to be the best beer pub area in Germany. Today? The power-players that work there...pack up at 5, and leave for homes way outside of the shadow of Frankfurt.
I was stationed at Spangdahlem AB my first tour, and then to the 5th Combat Comm at Robins AFB (GA). I dis six and gout out.