Step-by-Step Guide

1. Place the lounge sofas and coffee table in the curved lower-left alcove. Start by arranging the long red-velvet sofa along the inner arc, backed by the curtain wall. Position the loveseat opposite to face inward, with an oval coffee table centered between them. Decorate with a wine bottle, goblets, blue glasses, heart cushion, and pastel pillows. Add a side end table with a candelabra, small trinkets, and flower vases for balance.
2. Place the arched stage window, red drapery, and grand piano behind the lounge. Dress the back wall of the alcove with the arched window and red theater drapes. Set the white grand piano slightly off center, matching its lid with the arch curve. Add a piano stool, pink rose planters, and a small blue lantern for ambiance.
3. Place the fireplace, gramophone, clock, and wall art along the lower-left inner wall. Mount the fireplace near the stairs' left, then position a gramophone on its cabinet. Place a grandfather clock nearby and hang wall art above the mantel, with blue spirit-flame lamps along the walkway, completing with a small cabinet, pink lamp, and crystal.
4. Place the entry arch, wall sconces, haunted tree, coffin, and stair decorations on the lower-right. Position the door arch and clock above it, align potion-lantern sconces on the wall, and stand the coffin at the stair base. Decorate with skull clusters and teal flames, then plant the haunted tree adorned with ornaments to complete the space.
5. Place the alchemy lab on the upper-left balcony. Set the cabinet with potions in the left corner, center the star-carved rug with an alchemy table on top, and mount a shelf for the globe, books, and beakers. Add distiller and flower bouquets for a completed look.
6. Place the stained-glass windows, vanity, and standing mirror along the upper-right interior wall. Set the vanity beneath the center window, with a pink flower vase and potion bottle. Angle the mirror towards the bed for proper lighting, and add plants for aesthetic balance.
7. Place the canopied bed, bedside table, cat, cradle, and gold chest in the upper-right suite. Position the bed along the railing with a cat on its pillows, a bedside table, and install a cradle and chest in the nook, assuring proper spacing.
8. Place the balcony railing, rooftop roses, turret, and hanging lights as finishing touches. Install wrought-iron railings, fence, and rose hedges crowning the roofline. Anchor the turret, add hanging lights, and initiate snowflake particles for effect completion.