We had a wonderful experience at Helena's apartment and Lisbon itself. The apartment is in a great location and near all the sights. We came with two young children in a double buggy but the apartment is huge and we had no issues even with the 2 short flights of stairs. The apartment is really well layed out and we loved the kitchen. Would definately reccomend. Only 2 drawbacks but they did not affect our stay enough to warrant not returning. There is a smell from the toilet occasionally but it's not a big deal and air conditioning units hide behind curtains when drawn so do not work efficiently if fully closed. As I said don't let these hold you back from booking though!
Helena herself is great and was so helpful even carrying bags, taking me to the apartment and is currently helping me ship back items I left there! She's great.