Соответствие цены и качества полета. Нормальное обслуживание на борту. Есть напитки холодные(вода, соки) и горячие(чай, кофе). Можно подкрепиться во время перелета бесплатной шоколадкой или хрустиками.
I've been flying with Fly Niki for two years and I am quite satisfied with their services in general. Except for a short delay due to poor weather conditions I haven't experienced any troubles during my trips. The crew is professional and they provide good comfort to the passengers (the even offer free magazines and newspapers but only in German language). Even if there are cheaper low cost airlines, I think that Fly Niki is a trustworthy company and their services are a good value for money.
Estimate your luggage well: As cheap airlines are trying to minimize their costs they usually have a restrictive luggage policy. - You can board the plane with only one piece of hand luggage (usually not heavier than 10kg and with maximum dimensions of 55x40x20cm). For detailed information on hand luggage allowance check the website of the carrier. - If you plan to also take hold baggage with you, you will need to pay for it online (when you book your ticket) or at the airport. Keep in mind that it is cheaper to pay for your checked-in luggage online than at the airport.