We can start on Rossio, then go to Mouraria, a multicultural neighborhood today, the moorish area back on Medieval times.
Walk around the Castle walls and understand it's power and importance on the growth of the city since roman times, then we can go down to discover Alfama, discover the alleys, the narrow streets and speep stairs that mark the urban structure of this old part of the town.
Then we walk near the river cross downtown Terreiro do Paço and go up to Chiado and see the new city.
There we have a meal and talk a little bit of Portugal, Lisbon, our culture and way of being :-)
Cheers! Saúde! Tchin tchin!!