Martha was there to greet my friend and I and let us into the apartment at exactly the time we had arranged. She was very efficient in making sure we knew where everything we needed was and invited us to contact her if we needed anything.
The apartment was lovely and clean with fresh bedding and plenty of towels to use in the modern en-suite bathrooms - each bedroom has one! It also felt secure and there were heaters to off-set the March chill in the evenings.
We enjoyed our breakfasts of freshly squeezed orange juice and toast (Marta left oranges and bread for us) on the sun-drenched terrace.
The location of the apartment is brilliant - on a quiet street in a lively 'real' Lisbon neighbourhood with great little tascas and stone's throw from the two best viewpoints in the city, and the No. 28 tram!
Also, Marta was extremely generous in allowing us to leave our bags at the apartment for the rest of the day we checked out on as our flight was only in the evening. A huge help.

The only slight negative was the lack of sound insulation in the twin room - the noise from the flat above was quite loud at night. Other than that though, it is hard to find fault at all with the accommodation.
All, in all, I would highly recommend staying in Marta's lovely apartment!
Thanks again, Marta! :-)