We had a nice stay in Rita's apartment, with a few minor issues.
The apartment is very pretty and well-designed, just as it looks in pictures. The bed and linens are extremely comfortable, which we really appreciated. And the location is awesome. It's not right in the city center, but it IS a super short walk to the famous 28 tram, which takes you everywhere you want to go in Lisbon. And Campo do Ourique is a fantastic neighborhood in its own right, with tons of amazing bakeries, restaurants, shops, etc. and a beautiful park right next door.
That said, given the sterling reviews we had seen for the flat before booking, we maybe expected a bit more. Just be aware this isn't a luxury apartment. Everything was clean, but not exactly sparkling. The fridge had a pretty strong fish smell (presumably from previous guests) - we were able to get rid of it with some lemon juice, but it wasn't a great first impression. And for a week-long stay, we were left with only a couple rolls of toilet paper, a quarter of a roll of paper towel, no laundry detergent/softener, and 1 tablet of dishwashing detergent. Obviously we were able to purchase these items without major expense, but it would have been nice to not have to worry about it. We also had a minor scare with check-in that ended up working out fine - just make sure you've clarified details on check-in with Rita.
All in all, Rita's apartment is very pleasant and the value for the price is definitely there. Just be aware that although the design is truly beautiful, this isn't a luxury rental.