At the moment I would avoid all of them. The entire EU is falling apart (both politically and economically) causing many issues. England is struggling for independence from the EU, causing political unrest across Great Britain and the broader European mainland. Germany represents (pretty much) the entire European economy, but their leader is absolutely crazy and has lost support of the government (huge possibility she will be removed from power by the end of the year). They also face severe economic sanctions on their core industry from some of their largest trading partners (England and United States) as a result of her poor policies. Greece and Italy are both economically unstable and close to bankruptcy (again). Spain isn't too far off. Germany, France, England, and all bordering countries are swamped with terrorist as a result of the influx of Middle Eastern freedom fighters.
With that said the safest, most stable countries are probably Switzerland, Sweden, Norway, Finland, Poland, Denmark, Belgium, Ireland, and Scotland. At least those would be the ones I would select if I had to.