Our group of four adults had a wonderful stay at Casais da Bandeirinha. The space was beautiful and peaceful thanks to Cristina's artistic eye, the beds were comfortable, and the separate shower/toilet arrangement alleviated any bathroom traffic jams. We especially appreciated Cristina's extra touches of breakfast items, port, and chocolate!
Cristina (who lives on the premises) met us personally at check-in and again came down to say goodbye. She is very friendly and helpful.
The location was easily walkable to the historic center. Parking is indeed tight (it's a narrow street with a mix of paid parking, resident zones, and "not sure but this might be illegal" parking), so if you're bringing a rental car, we recommend checking out the parking garage links Cristina includes in her listing.
Note: Through no fault of Cristina's, a new hotel in the area hosted two consecutive nights of rock concerts (until 2 a.m.) that disrupted the neighborhood's quiet vibe. I have no idea if this will continue, so don't let it dissuade you from staying here; maybe just check with Cristina about it first in case you're a light sleeper.
Overall, beautiful place, perfect location, and excellent stay! We highly recommend it.