Step-by-Step Guide

1. Place the staircase along the left wall. Position the modular staircase along the bottom-left edge of the main floor platform, ensuring it hugs the front edge of the left panel and each step clicks into place without gaps.
2. Install the kitchen sink and countertop under the stairs. Locate the lavender-and-white sink module, fitting it snugly beneath the second and third stair treads. Attach the matching countertop piece to the right, forming a continuous surface.
3. Position the pastel yellow fridge to the right of the sink. Ensure the fridge aligns flush with the platform edge and does not overlap with the countertop or sink.
4. Add the dining table and chairs on the bottom floor. Place the small pastel dining table with stools on the front-center of the left bottom panel, aligning the legs with the panel's bevel.
5. Position the TV stand and television on the right bottom panel. Place the low wooden TV console against the back edge of the right platform and center the flat-screen television on top.
6. Place the L-shaped sofa on the bottom floor. Drag the cream-colored sofa to the front-left corner of the right bottom panel, aligning it with the panel edges.
7. Arrange the bed on the middle floor. Place the soft-blue-and-white bed module against the left-side back wall, ensuring the headboard touches the grey support.
8. Set up the study area with desk, chair, and bookshelf. Position the wooden desk to the right of the bed, tilt slightly for a natural look, and add the chair and bookshelf without overlap.
9. Furnish the bathroom behind the middle floor. Position the toilet module and glass shower enclosure properly, with the bath mat outside the shower door.
10. Decorate the rooftop terrace. Center the wooden picnic table and arrange five potted plants along the railing. Hang string lights and place a telescope and whimsical cat figurines for decor.