Do I have a right for a compensation?

I have a real issue with my current booking. The window is too low on a ground level and opens only fully or on 1 cm. The outside is a horrible heatwave 35* and I had spent 4 nights without proper air. I can’t open the window for a night - everyone can get inside easily, even me. Either robber or raped. The owner said “I can’t do anything, okay, bye-bye”. I paid £550 for this. Really would like to get every penny back. What’s the best way to do it? I’m gonna take some pictures now