Downtown Lisbon has been the subject of traffic calming measures in recent years which has made it even more unfriendly for those who want to drive into the city. You end up having to drive 1km down a road before you can double back.
Unless you are staying in a hotel somewhere in the area of Avda. Jose Malhoa, or similiar, where you can easily get off the motorway ring road, I do not recommend it. Stay in Sintra, Carcavelos, Estoril or Cascais and use the excellent suburban railways to commute in and the metro,tram and bus to get around in the city..
