I do not read books as often as I watch movies, but I am willing to create a habit of reading by taking a suggestion for a book from this community, and I want to start from this genre.
However I am quite picky in this matter. I cannot stand romance involving breakups, betrayal, love triangle or anything of such sorts. All I am looking for a simple story where only the couple is the protagonist, if you understand what I mean. I do not wish for any other character act as a rival in their relationship. Minor inconveniences or tensions could still be tolerated but I wish for the couple to have a satisfying ending as they were destined to by spending time with each other or being involved in circumstances that reveal similarities between them.
I would be more inclined towards stories with settings during the present times or having the characters hate each other at first, but these are optional.
Definitely not my genre, but you could try The Rosie Project by Graeme Simsion? It's fairly comedic but I think checks all your boxes pretty well, including the last two (maybe not quite hate but definitely don't view each other as romantic prospects)