I used the La Siesta Clinic last time I renewed (2yrs ago) ... they were very good and much more thorough (especially the medical/sight/hearing) than the previous 2. That may not be a good thing if you think you are 'on the limit' in some respect
N332 have put a video of the La Siesta procedure on line ... you may be able to get access to it by googling lasiestaclinic.com
The 2-handed co-ordination exercise is by far the hardest IMO, but don't be downhearted if you think you have done very badly ... I am pretty sure that it is virtually impossible to keep both cars on the road simultaneously for any length of time ! Mine was beeping away like mad, but the tester said something like "You have only scored 9000 penalties ... that is quite good!"
It is a very professional place all around ...can't recall the exact cost, about €70 I think ...
BTW, I hope no-one has to put up with what i had in changing to a Spanish licence at 70 .... the Trafico and DVLA between them kept losing my application and it took me FIVE YEARS eventually (I didn't chase them every week, but I needed a valid licence, so just renewed my UK one, while they were faffing around )
If you need help, I would recommend Amanda 965322866/625864373 ... she goes to trafico and ITV virtually every day, and she was the one who cracked it for me ...very nice lady, too