Our stay at Helena's apartment was perfect from start to finish. We were a group of four Americans travelling together for 6 nights in Lisbon. The apartment itself is just as pictured and described: clean, spacious, comfortable, and well-equipped. Helena exceeded our expectations as a hostess (it was our first experience with Airbnb, and Helena has now set the bar high!). She was very prompt with all communications and answered all of our questions, putting our minds at ease. She arrived precisely at the agreed-upon check in time and was very welcoming and helped orient us to the city. During our stay one member of our group fell ill and required ambulance transport to a hospital in the middle of the night; when we called Helena at 3:00am and woke her up, asking for help, she was a rockstar and helped us make contact with emergency services. Later on - once we had returned to the U.S. - she emailed just to check in and see how our sick group member was doing.
Helena's apartment is conveniently located in Bairro Alto, a short walk from the Baixa-Chaido metro station. From the apartment we explored in all directions on foot, including to the far east side of Alfama. The terrain around the apartment (like most of Lisbon) is quite hilly - so be prepared for some steep walks. Walking down to the river for meals at the Mercado da Ribeira food court (a must-do!) took about 15 minutes.
We made use of the washing machine to do a laundry, and Helena had the English' user's manual available which was very helpful.
One thing to note: noise from the street below the apartment was notable (bar-goers) most nights until 1-2am. It happened to be Carnival during our stay, so we're not sure but perhaps the partying was greater than usual. We downloaded and used white-noise apps to drown out the sound, so we were able to sleep with no problem. For anyone who is especially sensitive to noise, however, this apartment might not be a good fit.