Yads, me and 2 buddies live in a brand new quadplex infill and our building is great. They used some space aged soundproofing between the units and we can't hear anything from the other three at all.
However, the apartment building directly next to us is very close to our front door, and one of their windows opens right into one of our upstairs bedroom which has led to some heated arguments with the absolutely nasty hags living there. They claim that we intentionally keep them up at night with lights going on and off, even though we have motion detector security lights all along our walkway which we can't control. They even called the cops on us once when at 8:30 pm a visitor went out front to smoke and said that he was too loud.
If you are going to do it, I would make sure that you have ample space between your new infill and the (probably) crappy old place that still exists next door to avoid dealing with unreasonable neighbors.
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