My stay with Mariana was very comfortable. Mariana was very welcoming and speaks fluent English, so she was able to give me some useful advice about what to do on the day I arrived in Lisbon.
My room was exactly as described and was clean when I arrived. There was occasionally some street noise (ie garbage trucks in the morning) but generally Rua Maria is a fairly quiet street. Mariana's place is very secure since there are 2 locked doors separating it from the street. Mariana let me use the kitchen and washing machine as I wished. The bathroom was always clean and the shower was fine.
During my stay I also met Mariana's young son and housemate, both of whom made me feel welcome.
The location of Mariana's place was very convenient for me - it's a 3 minute walk to the nearest metro station and only a 15 minute walk from the beautiful Alfama district, which I thoroughly enjoyed exploring.
Finally, Mariana was very kind in letting me keep my belongings at her place on my last day. My train was departing at 9.25pm and I was able to leave my things at her place for the entire day which was very helpful.
Overall I really enjoyed my stay with Mariana and if I return to Lisbon I would definitely stay with her again. Obrigado!