Had a most enjoyable three nights stay at host, Monica's house which is located in a non-touristy area quite close to the airport.
A couple of Metro stations nearby provide economical, easy access to the historical centre, Zocalo, etc.
A very appetizing breakfast being gratefully received
Monica gave me information on places to visit, how best to get there and very kindly arranged for a taxi to take me to the airport on the final day of my trip.
Many thanks Monica, hope to return sometime in the future.