Cafes or Coffee Shops that take reservations?

I meet with a small group of friends (usually around 6 or so) about once a month on Sunday afternoons. We’re mostly in North / Central Tokyo.

Some people get light meals, some just have a coffee or dessert. I’d like to have more options for cafes that take reservations for when our usual place is fully booked. I’ve tried checking around with tabelog, but most of its offerings are for restaurants offering full meals. Does anyone have a recommendation for a cafe, or a place to look for one?

I’m okay with a small table charge, if necessary, but renting a private room seems like an unnecessary expense if I can avoid it.