My family of four enjoyed our stay at Helena's place. The kitchen was fully equipped, allowing us to cook multiple breakfasts and dinners. We found the family room to be just big enough for us for family dinners and a little Netflix before bed. We adored the breathtaking view from our balcony over coffee each morning. Our two daughters enjoyed the twin beds in their own room.
Helena was an incredible host, meeting us at the apartment for a walkthrough and to share with us a bunch of nearby recommendations on a map. She was quick and kind in response to all of our messages and she even left us a welcome gift of wine, coffee and a few other treats.
The location was an 8 minute walk from the metro and a 15 minute walk from Alfama and the city center, though we did end up taking Uber (which was often cheaper than for bus/metro tickets 4 tickets) most of the time due to cost and hills.
I would stay at Helena's apartment again.
I would recommend the apartment to most family and friends (with the exception of those whom might need to avoid hills or want to be a little closer to the main shopping/dining districts and public transportation).