What do you think of this twinset?

Margaret and Virginia are classic, lovely, under-used names.

I really like them and the nns are good.

Margaret has more nns than Virginia but that's just a plus for Margaret and takes nothing away from Virginia.

Rose is a filler but works exceptionally well with Margaret which requires a simple middle name for good flow.

Belle is cheesy...is the Virginia bell as well known as the Liberty bell, the bell of freedom?

Yes, a single-syllable middle name works best but not Belle.

Try Virginia Claire, Virginia Tess, Virginia Beth, Virginia Faith, Virginia Grace, or Virginia Paige.

Margaret Rose: Love it! Margaret is strong, elegant, and timeless, and Maggie is a darling nickname. Rose is a common middle name, but because it matches Margaret's timeless, feminine style so well, it's fine here.

Virginia Belle: I don't like this one as much. Virginia is a fine name in itself, but these days the "Virgin" part would almost inevitably lead to teasing. And Belle seems too chopped-off and cutesy to be a name by itself...I only like it as a nickname for Isabelle, Annabelle, etc. Further, Virginia Belle seems too phrase-like, like you're talking about a Southern belle on a Virginia plantation.

I would suggest making Virginia the middle name and picking a different first name. Or if you really like Ginny, what about Ginevra? Ginevra Isabelle, Ginevra Mirabel...

Those are really pretty and go together like peanut butter and jelly!

Very nice names

Nice names. Enjoy your little bundles of joy.