Thanks all for your replies. Good to know there are different opinions and arguments. But as the majority here thinks i have my reason, i will escalate it to airbnb and ask what they think. At least i know that's it not completely unethical to ask for a certain compensation.
I do think that the hotel analogy is a good one. Even more, i have had a couple of similar incidents on an airplane - where advertised wifi suddenly stopped working in the middle of the flight. I believe we all agree that wifi on board an airplane is not yet being treated as a matter of fact, as on the ground, but still every time i've got compensated by the airline.
As for moving out... well, that's always an option, of course, but that's the last resort, really. This was not the situation to move out, there was plenty of room to solve the problem. Finding another place with the same features and in exactly the same location is almost impossible - and i'm very sensitive to details and carefully choose a place based on many-many factors. Even so, it would take a lot of time, which once again for me is lost income. However, if internet would have stopped working for good, i certainly would have moved out. But this was not the case; it kept re-appearing every evening/night, which kept giving me hope that everything was finally fixed, and the next day all repeated.
And as for communicating with the host - well, as i described, the communication didn't work out. They kept telling me that it's the fault of the provider and they can't do anything. In this case, for the sake of my well-being and considering unpleasant previous experiences i had in life, i prefer to "survive" for a week without confrontments and then solve it thru airbnb, after all that's why we pay the airbnb fees, to have us protected. It's much easier to solve such incidents afterwards then wasting time and mental health in the process.
I'll let you know what airbnb's decision was.