Alternatively transport from the Airport. Some Airports can be an utter nightmare, Miami being one of them as the Cabbies Union managed to stop the Metro from being built to the Airport. There is a Van share so if you are travelling alone this is an option and probably exists at other Airports and is worth looking into.Im currently on the last day of a three week trip around Asia. First week wasnt solo but the last two were. In the three weeks I went to 3 countries. I also did a solo trip to the US last year for two weeks.
I found long haul solo fine. This trip was scarier with more language and cultural differences and I still really enjoyed it. I had one issue getting from the airport to the city but I worked it out. I learned my lesson to check if there are airports nearer the city in future and not go for one a few hours outside the city.
I find most of Europe pretty good even if the Airport is out in the boonies.
I'm a big fan of Austria and this is a great Country to visit solo, a few days in Salzburg and then a few days somewhere like Zell am See would be a great trip.
Weather in the Summer is lovely, odd shower but if sunbathing it's not worth going indoors, just stay at the pool and it passes.