Entire floor vacant - Every day and night come home super quiet because the entire floor (let's say 10 units) ... all are unoccupied

Your floor got noisy neighbour - The neighbour on your left likes to make noise during the day and on your right likes to party at night

Your floor got dirty neighbour - Your neighbour likes to throw rubbish on the corridor. Sometimes leave rubbish near the chute.

if its a high end luxury apartments, I would opt for (1).

(2) and (3) mostly happened in low, low to mid and mid cost apartments, and the design of floor plan and apartment itself, or apartments filled with Airbnb guests.

Good if you occupy high end luxury apartments.

But what if you occupy low, low to mid low and mid cost apartments?

Honestly, if I can live with it, so be it. Otherwise sell is the option even though have to lose some money.

I believe that the dirty/noisy neighbour option should be consolidated as a bad neighbour.

My aunt used to stay in the same condo as me, but in a different block. She bought it from an owner who sold it at below market (RM 20k or RM30k lower) price 6 years ago. After living there for 2 years, she moved out to another condo (an upmarket one at that) because of an irate Caucasian neighbour living below who keeps harassing them a few times a week complaining about the so-called 'loud banging' noises she and her husband make. All they did is the normal routine of going in and out of the house or going from room-to-room while closing the door like any average Joe/Jane would do.

The previous owner only mentioned it when they checked with him and the former also mentioned that his 2 tenants who used to stay there left within less than a year after dealing with that irate neighbour. What I've also heard about that block is that there are more problems (uncivilised and ill-mannered folks) there compared to our block where the folks in the latter tend to be well-mannered and civil.

is the ceiling/floor so thin that sound passes through that easy?

Wonder why office building doesn't have any sound from the above though

Some people have high level of sensitivity of their 5 senses.

you take the words out of my mouth.

Thanks for the compliment. Didnt know I so 'kheng'

Option 1.