Hotels offer many free perks to customers, but none are more important than free WiFi according to new customer service survey. Some hotels have been forced to cut corners to save money, and their customers have noticed. According to a new survey, satisfaction with hotel services is now at a six-year low.

Paying for WiFi is a huge thorn in the sides of travelers. In fact, hotels that charge WiFi fees rank 76 points lower on average than those that provide it at no charge.

Here are the hotel brands with the highest customer-satisfaction ratings in their respective categories:

Luxury: The Ritz-Carlton
Upper upscale: Omni Hotels & Resorts
Upscale: Hilton Garden Inn and SpringHill Suites
Mid-scale full-service: Holiday Inn
Mid-scale limited-service: Drury Hotels
Economy/budget: Jameson Inn
Extended stay: Homewood Suites