A nice washroom interior design is one that balances functionality, aesthetics, and comfort to create a space that is both practical and visually appealing. The overall design should reflect the personality and style of the owner or organization, while also considering the needs of the users.

Key elements of a nice washroom interior design include:

Cleanliness: A washroom should always be clean, hygienic, and well-maintained to ensure the comfort and well-being of users.
Lighting: Proper lighting can enhance the overall ambiance and create a welcoming atmosphere. A mix of natural and artificial light can be used to create a warm and inviting space.
Color scheme: The color scheme should be carefully chosen to create a cohesive look that complements the overall design of the space. Neutral colors such as white, beige, and gray can create a timeless and elegant look, while bold colors can add a pop of personality and energy.
Materials: The materials used in a washroom design should be durable, easy to clean, and moisture-resistant. Common materials include ceramic tiles, glass, stainless steel, and natural stone.
Storage: Ample storage is essential to keep the space organized and clutter-free. Wall-mounted cabinets, open shelves, and built-in niches can all be used to maximize storage space.
Fixtures and fittings: The choice of fixtures and fittings can have a significant impact on the overall look and feel of the washroom. Chrome or brushed nickel fixtures can add a touch of elegance, while matte black or brass fixtures can create a more modern and edgy look.

Overall, a nice washroom interior design should be a space that is both practical and aesthetically pleasing. It should reflect the needs and preferences of the users while also being easy to maintain and keep clean.