Helena's place was great, very clean and located in the heart of Alfama, near to the Miradouro de Luzia. We had a little trouble at first to figure out how to open the lock but we got it and did not have any issues after that.
Pros:
Located in the oldest hood of Lisbon, great location and really good for a couple.
Kitchen works like a charm, and bathroom is not that small.
In not more than 5-10min you can take a bus, a tranv or metro.
Cons:
That little issue that we figured out about the lock, nothing serious.
I would definitely recommend this place.