This story... where do I even begin. Well, first of all it's RATHER LONG, almost 500,000 words, but don't be TOO intimidated, it honestly doesn't feel like all of that.
First off, I have to say this... THIS FIC IS NOT FOR EVERYONE. Not even remotely. If you can handle M-rated smut, albeit well-written smut in my opinion, then proceed on. It's not really simply written porn, there's a whole TON of meaning incorporated into it.
I have to disagree with one of the reviews on this. I found the characterizations quite unique while still somehow being very recognizable as those characters. And the character development is wonderful, it's overall not as serious or angsty as other fics out there but there's definitely moments of those as Lovino goes around Europe discovering more about Antonio's past. Even so, the tone overall is more lighthearted and it's beautiful and lovely to see the Antonio/Spain's and Lovino/Romano's relationship through each other's eyes. It's great to see the change in Lovi throughout the fic as he becomes more comfortable with himself and showing his actual self and being more open about sharing his feelings and thoughts. Who knew he could be such a sweetie? And his point of view is one of the most enjoyable I've yet to read. So unintentionally funny and endearing, you see why so many characters get around to adoring him.
This is definitely not quite like other Spain/Romano fics I've read, or if it is it's the first one of that kind I've read and definitely the best. If you don't support the pairing, I can see why you may not enjoy it but then again you probably wouldn't be reading this fic.
There's a prequel story called "This Dance" and an in-progress sequel story called "And Three Makes Five", all three make for a great trilogy but it's not necessary to read all of them to follow the story.