My girlfriend and I had a great time staying at Teresa's apartment during our trip to Lisbon this week. It is indeed large and relaxing, as advertised! Great location on a quaint narrow street just behind the Sé (which served as an excellent landmark to guide us back after exploring the Alfama neighborhood and beyond).
When we arrived at the apartment Catia greeted us and gave us some pointers about the neighborhood and other attractions around Lisbon, and made sure we were settled in. Check-in and check-out were very easy with no problems at all. The apartment is very smartly furnished, and while we took advantage of some of Lisbon's numerous restaurants it appeared that the kitchen had everything one would need to cook a meal, if desired. Wifi was reliable and fast.
This is a minor point, and not unusual in urban apartments, but I will mention that the shower stall is pretty small and may be a challenge for anyone over, say 6' 2" or ~250lbs. It was unusually warm in Lisbon during our stay, so the front of the apartment (kitchen, living room) felt a little warm when we returned in the evening but the back room (sleeping area) stayed cool and we slept soundly each night.
Overall I highly recommend this apartment to anyone looking for a stylish, quiet, spacious apartment to call home while visiting the beautiful city of Lisbon.