I stayed at Catarina's place at the beginning of August, 2019. Communication with Catarina was great. Room as described. Great value for the price.
Location:
Linda-a-Velha is a quiet neighborhood west of Lisbon. From the airport, Uber cost me only 12.13 Euros. There are many options to get to central parts of Lisbon also by using public transportation. Google map doesn't show all public transportation operators. I didn't see bus #11 on Google maps, but it's its probably the simplest way to get to Marques de Pombal(Central Square). Returning back late at night was not expensive by Uber.
Amenities:
Catarina's place is 6-10 mins walk from supermarkets. Also, there are several smalls stores with fruits and veggies. I liked to have my morning coffee in Linda-a-Velha. Cafeterias are pretty much on every block. And it's pretty much only local people there. Modern laundromats are 6-8 mins walking distance. It was very handy for me since I did sports every day. Washing - 4 Euros( including detergents and two other liquids) Dryer - 2 Euros.
Activities:
Linda-a-Velha is right next to the area with plenty of sports facilities. 25 tennis courts, Golf course, Adventure park, several football and rugby fields, gym with a pool.