We didn't meet Ema but our host was very friendly and gave us lots of advice on what to do in Lisbon. They also booked a taxi for us to the airport.
The apartment was as described and in a safe, convenient neighbourhood, right by the castle and a Pingo Doce. Everything we needed for cooking etc was provided and it is only 5 minutes walk to a metro station or Rossio train station making it easy for us to go on daytrips. A couple of things to bear in mind - this apartment has only two windows, a skylight and an alley view, so it can be hard to judge weather and time of day from inside. Also the door lock has a certain knack to it so ask your host to show you how to unlock from the outside.

We would definitely recommend this studio for its location, amenities and layout.