Overall great place, very comfortable and safe. Few things to keep in mind though:
1. It's in alfama which is super touristy so if you want to experience local life, this isn't the area for you.
2. But noisy at night esp weekends and there's as restaurant that has Fado singers so it can be annoying to some but the music is lovely! Also right around the left corner there's a music school and the students stay up late practicing and singing outdoors some of the nights
3. Ubers can't figure out how to get to the street so you have to walk up or down to one of the main ones to meet there.
4. Get your electrical plugs so u can use electricity
5. Make sure to use the iron with a cloth on top of your clothes cause it can geta bit messy.
6. People who stay in the building can be easily heard esp with footsteps and can get annoying esp if you want to sleep in during mornings.