we  are   2  females  in  our  60's  ,1st  time  to  Paris  May  2025 .
the  2  districts  i  liked most  were  Latin  Quarter  and  Marais ,are  the  areas  suitable  for  1st  time  visitors , btw not much  on   metro travel  due  to  bad  knees  ,prefer  bus,uber,taxi.
will  be  staying  for  10  days  ,  looking  at  Hotel  Bretonneire  in Marais  or  Paris Art  Hotel  Latin  Quarter  hope  someone has stayed in  either  recently  would like  some  info.  I   did read  reviews  and  HB were  mixed excellent  to  terrible .
The other  Paris Art   Latin  Quarter  had  more  positive   than   negative  was pricier  than  HB,  appreciate  any  input.
Budget  about  250.00USD   per night.
Also if  do  take  buses  do  you  tap  credit  card  like in  London  or  NYC ?
Any  travel   tips  appreciated  ,will   be  going  to  the  iconic  sights  of  Paris .
thank  you
Since you mentioned taxi's...download the G7 official Paris taxi app. It's user friendly like the uber app, but for the official Paris taxi. Very clean and professional. No matter what other modes of transportation you use, it's so convenient when you want/need a taxi EXCEPT from CDG to Paris. From the airport just go to the official taxi stand. Do not be distracted by anyone offering you a ride. Just get in the official taxi line, and there is a fixed price from the airport to Paris (price dependent on left bank or right bank.)
to answer your actual question, you cannot just tap to pay on the bus (or metro) system in Paris, you must have either a ticket for that ride or a pass. 
parisbytrain.com is a great resource, basically all of the advise is the same for the bus.    i use the citymapper app and google maps to find what works.  citymapper has some options, including a less walking option (i use the bus a lot when i'm there as many metros have stairs and no escalators). 
Hotel Jeanne d'Arc Marais. We loved it. On booking.com but doesn't show prices/availability for 2025 but you might try their website direct.
Thank you , for some reason there booking page is not working. I will email them