There are common website that you can find rooms and apartments to rent while living in Poland. But first there are somethings we need to know about the rules and ticky points included in the offers.
The first thing is there is something called a deposit that you have to pay when renting a room in Poland. This is usually the same amount of money as a one month rent that you need to pay for the owner when signing the contract. this is used as backup for them incase any damage happens to the rooms or equipment inside the room. when you finish your contact they will check the room and return the money if everything looks fine. If not, they will cut some amount of money that they think will replace the damage.
The other thing is when signing a contract it is usually going to be for 6 months or 1 year. In case you decide to leave the house before the contract ends without notifying them 1 or 2 months before(depending on the rules of the contract) , guess what they will take the deposit :) .
And the rooms can be single or double but almost always the kitchen and bathroom will be shared with other tenants. The price ranges may vary from city to city but on average for single rooms it falls between 700 - 850 PLN.
Make sure to check the offer that the rent you pay includes all utilities(electricity, Water, Gas, Internet...) or else you might need to pay additional fees for these services.
* Olx.pl
This is a very good website to find accomodation. You can filter your options based on city, Region , Price etc...
There will be images that show the rooms and along with that there will be a form that you can write a message to the owners.
You can also call them or send SMS messages directly to the owners by clicking the call me/ SMS button and the phone number will be displayed.But be sure to create account and log in first. or else the phone number will be displayed.
* Facebook marketplace
Facebook/Meta has a tab called marketplace where you can find all sorts of things to buy starting from electronics devices to clothes and many other things.
For our case , it has a section called Rentals and inside there you can find all sorts of deals for renting rooms. Similar to olx.pl it offers many filtering options that you can use the best deal for you.
Upon seeing the photos of the rooms, you can write a facebook message to them asking the availability of the offer and any additional questions regarding the rooms.
If agreed, you can set up a time to meet and move to the next step of the rental process.
Other website liste include -
Otodom.pl(https://www.otodom.pl/pl/oferty/wynajem/dom/warszawa/mokotow?market=ALL&distanceRadius=0&locations=%5B%5Bobject+Object%5D%5D&by=DEFAULT&direction=DESC&locations[0][regionId]=7&locations[0][cityId]=26&locations[0][districtId]=39&locations[0][subregionId]=197 ) -- slightly expensive
cityrooms.pl
studentdepot
some universities provide student dormitories
A full guide on how to rent an apartment in Poland can be found here: https://littlehome.pl/a-complete-guide-to-renting-an-apartment-in-poland-for-foreigners/