You are going to need a large MASSIVE space wheel to do that easily without causing the rest of the station to wobble. If you want to do it "small" with a counterweight, you will have to balance it perfectly (won't happen) as the person is MOVING around in the rotating space. This will cause wobble in the rest of the space station - destroying the zero g environment you want there. And when the person wants to go to zero G, what are you going to do with all the rotational energy and momentum? So it's not just a counterweight - you need a counter-counterweight that is spinning in the OPPOSITE direction of the person+counterweight to ensure that Total Rotation Momentum = 0.
And since it is spinning, the direction of rotation is fixed in space, which means over the 90 minutes of the orbit the rotational section will need to rotate 360 degrees.