There is a special place for wheelchairs users, this is a spot that is sponsored by a local bank and is situated in front of Pincho's. This area is closed with fences to protect the users and they even have security guards and is allocated only for special users. They usually even offer snacks and soft drinks. It can also be identified by the very big flags of the sponsor bank. So there is a place and it is not only for local people but for guests in wheelchair or handicaps.
Though the info is from two years ago, if you contact taxidriver directly he can probably tell you whether this is a spot which is still used.