A sister who worked at a cleaning company for three years told me, never rent a newly renovated apartment with soft furnishings.

For one person, rent an old apartment in an old neighborhood.
For couples, even more so, avoid those influencer-style move-in-ready apartments.
She has seen too many landlords, in order to raise the rent, immediately put a freshly painted apartment on the market,
with formaldehyde test kits placed there that haven't changed color yet, and tenants sign the lease before anything is noticed.
You move in and think you're getting headaches from overtime fatigue, but actually the walls are biting back with every breath.
She saw the most extreme case where a landlord added a clause in the contract: "Party B shall evaluate air quality independently,"
and tenants never saw it.
Every time she does deep cleaning for a vacated apartment, she places a formaldehyde test strip at the very back of the drawer,
not included in the contract, just left there.
On the first day the next tenant moves in, they open the drawer and see the strip, with a line of ballpoint pen writing beside it: "Test before living."
She said the strip has expired and can't be trusted anymore, but leaving it there at least forces you to open the windows and ventilate for two days.
After she left the cleaning company, the landlord removed the strip and erased the writing,
but she still kept the draft of that line in her phone memo: "Test before living, don’t learn from me."