When north is at the top and the terrain is flat (I cannot clearly see the contour lines): 57 or 62 - if the evening sun is the focus, 66 if the morning sun is more important.
Reasoning: Avoid property boundaries adjacent to publicly accessible green spaces or streets. This provides the best privacy and prevents things from flying over the fence. Do not choose a property in a hollow.
I cannot assess the property size, traffic on the greyed-out street, and the location east of the development area. If traffic and pedestrian use are low and the eastern green strip is rather not publicly used (no path and narrow) and the plots are rather small, I would find 76 very attractive. Of course, it is always a question of budget. I prefer a smaller house on a larger plot, which is naturally not a standard but something to consider.
A 1.5-story city villa sounds odd. I assume you want a square floor plan with as much usable space as possible on the upper floor, or in other words, maximum square meters for minimal price. Whether the 0.5 extra floor is allowed, I cannot say. On a larger plot, it is easier to build single-story if that is strictly required.