Is the rent fair
The rent asked against what leases in the same census section declare for a flat that size, from the state's own reference, and what new leases in the town average where the deposit registers publish it.

Paste the listing or type the address. homie checks the rent against what leases around it declare, whether the town caps it, what the lease must respect, and the flat itself: noise, sun, energy, the building. Free, with no agency.
The rent asked against what leases in the same census section declare for a flat that size, from the state's own reference, and what new leases in the town average where the deposit registers publish it.
Whether the town is a declared stressed area where rents are capped, what the cap means for this flat, how much the rent can rise each year, and what the landlord has to put in writing.
What moving in costs (a month's deposit, two months' guarantee at most, no agency fee), what the law gives you, the aid you may claim, and the checks that keep you clear of a scam.
A lease runs five years, and the first payment often goes before you have read the contract. A flat that is loud, dark or cold costs you every month you live in it; a rent over the legal cap is money you can claim back.
Read off public registers and the law as it stands. Not legal advice.