It really depends on what your definition of Living is as compared with others in general. You have to look at what type of seasons/weather you prefer, type of cuisines, and basically the country's cultural background as compared to your personality.
If you're looking for a good standard of living, with big accomodations, cheap cars and amenities, I would suggest the USA (California), which is getting very international. The weather is also fantastic!
If you like the night life or are a foodie, South-east/East Asia is very renowned for it, but their cities tend to be very expensive to live in. Such as Hong Kong (Mandarin Cantonese), Seoul (Hangul) or Singapore (English/Mandarin). But one thing's for sure, if you're ever hungry at 3am, there will still be a place for you to have supper! But the working environment is very competitive.
The UK is more slow-paced when compared with the other 2 regions, however they do not react kindly toward foreign workers, and you may find it harder to get a job to settle down. The weather is also full of surprises and it will get very cold and wet most of the year. But, it is a very good place for international students to come to, in the short term. Food is especially great if you live in London!
All in all i cant say much, as I would think that my home country Singapore is the best country to live in, although I do admit I've always harboured the intention to live abroad; the likes of the USA or Europe, as their culture makes me feel like I'm experiencing new things everyday.