I liked it, though I am not a huge fan of "parent trap" type stories. Aside from the slightly manipulative (and slightly unrealistic) teens, the characters were likable (hero and heroine were two nice, attractive characters), and there was plenty of steam. (Actually, I didn't even mind the two teens too much, though they did strike me as Stepford Teens.)
My main issue was there just wasn't a lot of conflict - two perfect people who are perfect for each other, with no real reason not to get together, so I never really worried for them. This did reduce the impact of the book for me and made it a little dull, overall, though a lot of readers will likely find the perfection of all the characters adds to the sweetness of the romance.
Biggest plus for me, the heroine is mature and responsible, and the hero is honourable and lovable, so the sexism one often finds in romance is simply not present in this book. (If stupid heroines and he-men heroes keep you away from many romances, this book might be great for you.) I could understand why these two liked each other, which made the love story realistic. I would certainly read more from this author because of this.