Everything went smoothly. Helena's apartment looks and feels even better than the pictures. Very spacious, just right for a couple. We had everything we needed (kitchen, coffee machine, towels, toiletries) and lots of local tips from Gabriela.
At night there might be some shouting from outside but the neighborhood still feels safe to us. We were tired from the trip so we still slept soundly at night.
The biggest plus was the amazing view of Alfama and the sea. The balcony might be a little small but I find it an authentic experience. From the bedroom window, the view is absolutely stunning. Great for watching the sunset/sunrise. You can't really see it from the bed but I enjoyed it nevertheless.
Right in front of the apartment, there's a very nice local restaurant. So if you want to quickly grab something, it's also very easy and the food tastes good!
Overall, if you plan to stay in Alfama (which I recommend because it is very different from the rest of Lisbon), I think you will have a good time here.