Your size restriction and btu load, and low noise is a tough combo as you know.
Do you have 230v?
I would want remote control. The ones with expanding shutters let outside noise in if that is a concern. You can throw the shutters away and have a pro install it with a panel caulked in.
One concept is to pre-cool the space, then lower the fan to minimum or off/on minimum as you listen.
After some listening, room temp rises, put it on high, walk away for a few minutes, return, min or off.
A higher btu unit will pre-cool or re-cool faster, then you get to low fan or off faster.