Not the original commenter, but my team uses CloudSQL MySQL. It's not too bad. It's pretty performant, but we've run into some weird issues surrounding replicas.

As far as I know, MySQL 5.7 is as far as they go and like PostgreSQL, they don't support point-in-time recovery. Also, perplexingly (at least as of a year ago?), deleting the instance deletes all backups associated with it, so there's an opportunity to accidentally blow away all your data. I'm sure Google can recover it, but you'll have to submit a support ticket for that.