[Grustaf]

Definitely go for it. No matter what you feel now, you will probably greatly enjoy the experience, even if you're not that excited about it beforehand.

I would sublet the apartment if possible, but if you can afford not to, that's fine too.

I don't know about the US, but as a Scandinavian my adventures in the my mid 20s certainly didn't hurt my employability. On the contrary I suspect that I've often been shortlisted because my résumé stands out. So make sure to do really interesting things! The main reason for that is of course that it will make YOU more interesting too.

So just do it, don't hesitate. Go for two years if you can afford it, there's plenty of time for working later. You will not regret it, but you will of course regret not going while you could. Once you have a family it will be much more expensive and complicated.