Paulo was a fantastic guide.  He is professional in every sense - taking care of his guests by every means from having a nice clean car, to staying flexible to changing needs and most importantly sharing all his knowledge from 30+ years of guiding tours around his country.  He took excellent care of my family of 4 (2 daughters - 17 / 13).  I highly recommend his Blue Coast tour south of Lisbon if you can fit it in your time with him.