What papers you are actually asked for, what a seguro de caución is, what dueño directo means, and how to run the search without losing money.
The papers they ask for
For a formal contract an owner or agency usually asks for ID, a CUIL or CUIT, and proof that you can pay: recibos de sueldo, monotributo invoices, or foreign income with bank statements. If you are new you may only have a passport and a residencia precaria, the paper the migration office gives you while your residency is processed, and no DNI yet. The DNI is not written into any rental law, but in practice a lot of owners and every garantía company will ask for it, which is why most newcomers spend the first months in the temporary furnished market and sign a formal contract later. What an owner can waive is the income paperwork, if the garantía is solid. What they rarely waive is the garantía itself.
Ask before you visit: with a precaria and no DNI yet, do you accept my file at all?
Seguro de caución, in plain words
It is an insurance policy that stands in for the garantía propietaria. Instead of finding a friend who owns an apartment in CABA, you pay an insurance company, and that company answers to the owner if you stop paying. You still owe the money, the insurer just pays first and then comes after you. Price is a share of the rent, quoted as a premium you pay up front or in installments, and it changes by company and by how long the contract runs, so get two or three quotes rather than taking the agency's preferred one. Two catches: the owner or agency has to accept that particular insurer, and the policy is underwritten on your income papers, not on your goodwill. The City runs Garantía + Fácil, which covers part of the premium for people who qualify, and the City housing site publishes what can and cannot be charged when you sign.
Ask before you visit: which garantía companies do you accept, and can I bring my own?
Dueño directo vs inmobiliaria
Dueño directo means you rent straight from the person who owns the place, with nobody in between. No agency fee, faster answers, and far more room to negotiate the garantía, the deposit and the currency. The trade off is that there is no one to complain to: if the boiler dies or the deposit does not come back, it is you and the owner. That is exactly why the written contract, the inventory photos and a receipt for every peso matter more here, not less. An agency charges honorarios and adds paperwork, but it also runs the credit check, holds the contract, and is the address you write to when something breaks. Neither is safer by default. What makes it safe is a signed contract with the real owner, checked against the property title or at least their ID.
Ask before you visit: are you the owner on the title, or are you renting it on?
Where people actually look
Four different worlds. The big portals hold most of the formal, peso, two year stock, almost all of it through agencies with a garantía requirement. Dueño directo and roommate groups on Facebook and WhatsApp move fast, ask for less paperwork, and need the most caution. Furnished temporary platforms are the easy landing for the first weeks or months, at a clear premium per month. And neighbor posts here on Pásala, free, no agency, with the filter for posts that do not require a garantía. If you have two weeks, look temporary and roommates. If you have two months and your papers, look formal: you will pay a lot less per month.
Ask before you visit: is the published price the rent alone, or does it include expensas?
How to run the search, week by week
Week one: pick two or three barrios and set a real ceiling that includes expensas and bills, not just the rent. Week two: get the file together before you fall in love with an apartment, ID, CUIL, income proof, and a garantía answer, because good places go in a day and the person with papers ready wins. Then message short and clear, who you are, what you do, when you can move in, and how you will cover the garantía. Visit in person, or send someone you trust: never a video tour alone. Sign before you pay, get a receipt for cash, photograph everything the day you get the keys. If anyone asks for a transfer to hold a place you have not stood inside, walk away.
Ask before you visit: how long is the contract, and how does the rent update?