Space Planning for Two Family Flats

I need an expert in space planning and interior design to help me layout two rental flats. The target demographic for these flats are families, so the design needs to be family-friendly.

Ideal Skills:
- Space planning
- Interior design
- Understanding of family-oriented design

Requirements:
- Optimal layout of kitchens, rooms, balconies, bathrooms, etc.
- Consideration for elements that are appealing and practical for families