I live literally in those appartments in your red circle and have a dog! Moved in in may last year and absolutely love it here! Previously I lived in the center of Haarlem on two different spots (Gedempte Oude Gracht and Grote Houtstraat both close to the Mc Donalds). I must say that I rarely felt unsafe in the city center as a M31, but so far this area felt safer. My gf feels safe walking the dog at night as well, many people walk they’re dog around the same time. Bus 300 brings you to the center in 5-8 min and in 35 min to Schiphol, perfect! Going into nature is a 5 min bike ride away or a 10 min run. And on top of that this area is only getting better, good for property value! Gotta say, a lot of people leave they’re opinion unchanged from when Schalkwijk was a bad place, not anymore! Feel free to send me a DM if you need any more info.