Touristic Cities to Avoid / to Tecommend (Noisewise)

Hello,

I plan to go to Lisbon some time soon, has anyone of you gone to this city already and what are your thoughts about it? (when it comes to noise)

I have been to Porto two years ago and I found this city especially noisy, mainly because of the very frequent use of siren by the emergency vehicles (I don't know why, I've been to bigger cities where it was much less frequent).
But anyway, how is Lisbon? I think there is much less traffic there due to the extensive use of the tram, so maybe it's relatively quiet compared to other capitals. Please let me know your thoughts about this city if you can.

Please also feel free to discuss how T-sufferers friendly are other touristic cities.
Thanks