A queen-size mattress typically measures 150 cm x 200 cm convert to approximately 59.06 inches x 78.74 inches. This size is popular for couples as it provides ample space for two adults while fitting comfortably in most bedrooms. 

Here are some key features of queen-size mattresses:

Versatility: Suitable for couples, single sleepers who prefer extra space, and even those who share their bed with pets or children.

Availability: Due to its popularity, accessories like bed frames, sheets, and toppers are widely available and often more affordable.

Comfort: Offers a balance of space and comfort, making it a preferred choice for many households.