Custom Personal Home Robot

I want to create a personal-grade robotic solution for use in the home. My primary goal is purely robotic in nature: turning a concept into a working device that can move safely around a domestic environment, carry out simple household interactions, and be controlled through a companion mobile or web interface. Here’s what I already have in mind: • Core functionality: autonomous navigation (basic obstacle avoidance), voice or app-based commands, and the ability to perform at least one practical task such as fetching light objects or providing room-to-room telepresence. • Hardware: I’m open to your recommended microcontroller or single-board computer, but it must be affordable and easy to source globally. • Software: preference for Python or C++ (ROS, OpenCV, or similar libraries welcome) so that future feature additions are straightforward. • Form factor: compact enough for apartments, aesthetically friendly, and safe around children or pets.