Just one small note:
By law, rental contracts in Brazil are fixed to a duration of 30 months. (That is not to say you have to stay 30 months though).
If you rent and cancel the contract in the first 12 months, there is a contractual fine which is equal to the unpaid balance of the first 12 months rent.
From the 13th month onward there is no longer a fine for cancellation, if you give notice of intent to vacate.
Rents can ONLY be increased on the anniversary date of the contract and are limited by law to a specific percentage (usually around the rate of inflation).
Most rentals require a deposit (usually equal 2 or 3 months rent) which then becomes the period of notice required to vacate. The landlord is required to use that deposit as the rent payments for the months following notice to vacate.
To rent in Brazil you may be required to provide a guarantor (fiador) or private rental insurance (or both) in order to obtain a contract.
Condominium fees are generally NOT included in the rent, they can be extremely expensive in some cases almost like an additional monthly rent payment depending on what is included. Only in the newest buildings in Brazil is water individually metered for each apartment, your condominium fee WILL NOT include the water bill in this case. If there is a single meter for the building's water then each tenant will pay a specific percentage of the water bill based on square footage of the rental unit they occupy. This is almost always IN ADDITION to any condominium fees and is supposed to be posted publicly somewhere in the common area of buildings for all tenants to see.
Landlords are permitted to pass their property taxes (IPTU) along to tenants, so this is something you must consider in your budget.
You are required to return a rental unit in exactly the same condition it was when you received it, except for normal wear and tear. If it was freshly painted when you took possession, for example, then you must repaint before you return the keys. If in rare cases a rental unit has appliances or other furnishings these too must be repared if you have caused damage, not normal wear and tear.
While the law requires ALL condominiums to have insurance that covers all of the buildings in case of catastrophic loss, many don't have insurance. You should ALWAYS arrange your own insurance to cover not only your contents, but also liability insurance to protect you should you be legally responsible for fire, etc., that causes damage to your unit and any other parts of the building. Better safe than sorry here. Can you imagine the astronomical cost of having a fire in your apartment that destroys a major portion of the building, only to find out later the condominium did not have the required insurance and you were being sued for the damages? Yikes.
Utility bills and the legal responsibility for paying them are tied to the property, not to the individual so your landlord will want to see receipts for payment of such bills even if they're in your name, to make sure that he's not going to be stuck paying for them.