When I went from being single to being in a family of five within a span of three years, I needed something to help keep all of us organized. The Cambridge Dated Planner fit the bill perfectly.
This planner is small enough (probably 5" x 7") to fit on the countertop without taking up a lot of space, but large enough to not get lost in the clutter. Each page that opens up has a week's worth of spaces to fill with appointments and meetings. Each day is segmented into times, but I have never used this option because we generally only have one or two appointments per day, at a maximum.
The Cambridge Dated Planner is good only for one calendar year, but they are inexpensive enough so that purchasing a new one each year is doable.
If you have a very busy schedule, or more than three or four people to keep track of you may want a day timer that has more space. There is also limited space for planning on the weekends, if this is a concern. But the Day Timer by Cambridge works well for my family of five.