Wow! I agree with Marie, best to just shut the door at night!
I would be afraid that one of my cats could fall from that second story balcony, trying to get away in a panic...
Plus if the neighbors cat manages to get into your apartment, your cats won't feel safe anywhere!
(Not to mention that unfixed male spraying things in your apartment!).
The only other thing I can suggest, is to look into something called 'Cat Fencing', and enclose your balcony completely, for everyone's safety!
"A Cat must have three different names:
An everyday family name; A particular name;
And the name but the Cat Himself Knows, and will never confess." T.S. Eliot
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