We had a super nice time during our stay in Lisbon. This was especially due to a very well equipped and beautiful apartment offered by amazingly nice and caring hosts. I can only recommend this place to anyone, who likes to be central and prefers a nice cold pint for 1,5 € in house over absolute quietness!
Concerning 'noises', I have to say that this is really not worth mentioning. This would never disturb anyone with a healthy sleep.