Parquet flooring is popular in many rooms of the home, including living rooms, dining rooms, bedrooms and hallways. It is not recommended to install solid wood parquet flooring in bathrooms or below grade due to moisture issues.
Parquet flooring can be installed over in-floor heating, but there are very specific instructions to do this properly and a professional is usually the best person to handle the installation.
Commercially, they are popular floors as well, and have even been used as flooring in many NBA courts, including the most famous one for the Boston Celtics (which was eventually sold in pieces as souvenirs). They are also popular in restaurants, gymnasiums, and they make beautiful dance floors.