I stayed here for one week on business: my company booked it based on suggestion of one of our local supplier.
When I entered my room I would liked to change the hotel. The furnishing was quite old and found some spots on the blanket. No international Tv channels, no frigobar, old tv, old shower.
Anyway the room was quite clean (excluding the blanket) and people working at the hotel (frontdesk/waiter) are very very kind, so eventually I decided to stay.
I got a weekly ticket for wi-fi connection (20euro) and the signal in my room was excellent (faster than at office).
The restaurant of the hotel is very good and with excellent quality/price, but opened only for dinner (I got all my dinner here). Breakfast is acceptable, but please do not take the orange juice!
I did not have so much time to go around, but Hyeres itself is an enchanting touristic typical Cote Azur village. It is at a walkable distance (10min) from the hotel.
At the end of my stay I cannot say it was negative, but If I go back on Hyeres, probably I will look for something else.