Just got back from a holiday there. It is green and lush with lots of mountains, turquoise lakes and waterfalls. It is a wonderfully safe country with low crime rates with the added attraction of being spotlessly clean. No litter anywhere. The roads are in great condition (no potholes at all).
Best of all, it is very affordable. Your money goes a lot further than in many other parts of the world.
For English tourists, it's a dream as English is widely spoken. Slovenians learn English as a second language at school. We found the Slovenians we met to be friendly and very polite people.
Finally, it is a foodies paradise. The quality is excellent.