The Erotic Highway
I live in a house, but I've done my share of condo/apartment living.
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The idea of a next door, or same complex SB could sound like the ultimate setting for a unicorn. The scenarios seem awesome: 1. It's 1:00 am and you'd like a quickie before you go to sleep... text her and 3 minutes later you are balls deep in her. Then she heads back and doesn't even need to use your shower and get your towels wet. (Side question: Why do ALL women need to use 3 towels when they take a shower? I only use one.). 2. It's the weekend and you feel like taking a drive up the coast. How awesome would it be to take her along and get some road head on the way? You grab a nice lunch and a glass of wine at a seaside restaurant. Then head home. 3. She's horny and her phone bill is due. You walk over to her place, bend her over the sofa and spank her until she's paid her bill. You head back and the wife is none the wiser.
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Or it could be a nightmare. 1. She decides to show up at your door, unannounced just as your wife's parents arrive for dinner. 2. You do something she thinks is "stupid" (note: there is just no way I can list all the things an SB could see as "stupid". TER does not have enough bandwidth to support that amount of data. 
and she decides to let her inner BSC go public. She keys your car, paints your door with the word "ASSHOLE" in red. Breaks your window and sets fire to your curtains, etc. 3. She turns out to be fat, a slob, and her voice is LOUD. You really try to be graceful and gentle when you back the fuck up and try to pretend you never met her. But she's there. You see her, standing in her doorway when you walk by on your way out of the complex. You see her at the mail boxes. You see her in the parking lot. And she's always smiling but has those "kicked puppy dog" eyes for you. You start looking for real estate agents to find a new place to live...
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So let us know which you get: The dream or the nightmare. 