Firstly, the host didn't tell me at all that the room that I booked is occupied and gave me much smaller and very different room from the room that I planned to stay in.
Secondly, when I came to the apartment and asked about the internet that I really needed for writing my thesis, the host told me that she didn't pay the internet fees for that month in time, so there was no internet at all. She said that she hoped that it would come in a few days, since she paid it the day before. Since I doubted the sincerity of the host I asked her nicely to send me the already paid invoice, in order to be sure that It will come soon. To which she replied that she was in a hurry and that wasn't actually sure if it's paid or not. It was very very stressful and unpleasant experience.
To be honest, I actually thought of not writing a review, since a very kind Airbnb agent, Martina, helped me resolve the problem at the end, but the arrogance of the host was too much. She actually was very angry and arrogant, especially when I agreed to stay and to receive a relatively small amount of the refund knowing how much stress I've been through. The host said that if I wanted to leave she would "have helped" me... I really don't understand how can someone play a victim when she is the one to put me in this unpleasant situation. It is very clear that the reason I booked much earlier the apartmant was to be sure to have nice place to stay and focus on writing my thesis and final exam and not to bothered by different room, no Internet and changing the apartmant. I don't like to fight, but I think it is important to share my not-so-pleasant experience. I really think that no one should experience situation like I did.
P.S. My bedroom wasn't very clean, just the pavement. The kitchen and the common space was ok.