The communication with Maria & Rita was very good - they are great, very helpful hosts and I can truly recommend them. The apartment itself has few big benefits and few disadvantages that you need to be aware of.
The view is indeed magnifique - probably even better live than on photos. This is the strongest point of the apartment for sure. The design inside is simple and beautiful and the flat is very well-equipped with anything you would need. Location can't be better - despite it's close to famous tram 28 stop, few great padarias, restaurants, shops and amazing view points, it's still very quiet! I would definitely recommend this place for a young, active people.
Now, you need to be aware it's third floor with no lift, plus inside the apartment there are very steep stairs to the second floor. Since the flat is located uphill, any trip outside requires to go up and down all the time (but in my mind it's still the most smart location you can get in Lisbon). The bathroom could a bit more comfortable but for us was good enough. I have to say we had a problem with ants in the flat (that strongly escalated during the last day of stay, so Maria & Rita had no chance to react), but, as hosts are taking care actively, hopefully they have already managed the problem when you read this.
In general, if the small issues are fixed, i would say that choosing this apartment and hosts is a great way to fully enjoy Lisbon - one of the best cities i have ever visited.