We will be visiting the following cities May 2018 and I am now in the process of looking for lodging except for Madrid where I will be using points for Marriott.. I am looking at airbnbs as we like having an apartment. What I need help with in all these cities is what area is the best for us to stay in.. we are an older couple who like to walk so not afraid to walk with luggage if need be 15 mins though not too much more.. we do not plan to drive if we can help it.. will be training it where we can and flying when distance is to far so sometimes coming from the train station and sometimes airport.
We are not into nightlife and need quiet place at night to sleep so if an area will be noisy at night that will not be good for us. I have done some research but its getting complicated so any help would be appreciated, an area in each city that is a good base to see the top sights from. We will do day tours if there are places we should see away from where we stay. Also not adverse to taking public transit if there is a good reliable system. Thanks!!
Barcelona fly to Majorca
Majorca fly to Madrid (poss Palma as it is central but I have read in May it should not be noisy at night)
Madrid train to Granada
Grenada train to Cordoba
Cordoba train to Seville
Seville fly to Porto
Porto train to Lisbon
Lisbon