I haven't rented from them, but I did visit the club last month when I flew a Cessna down there from London.
You're probably already familiar with
their web site.
The airfield at Mutxamel/Muchamiel is quite small and dusty but the club facilities are good, with a cafe on site. They seemed a friendly bunch, but English is not very widely spoken at the field so if you don't already speak some Spanish then an RT crib-sheet would be handy. You'll find examples on that web site under "En Linea"/"Intersante!"
There is an English member of the club who is very helpful and whose number I have if you PM me.
If it's of any interest to you there is an English microlight training school who operate from the airfield too - details
here.