Unfortunately I don't know of any reliable exchange for all Europeans. I now use a local exchange which works only in my country. I know exactly where their office is and I can actually go there talk to them in person. The "big exchanges" as they call them seem extremely shady. We don't really know who stays behind them and where exactly are they located. I don't want to use such services. I hope that eventual regulation will bring honest and reliable exchanges in the market. This is still the biggest weakness of cryptocurrencies.