I stayed at CAT's place for one week and thoroughly enjoyed it. The check-in process was very smooth, the cleaner welcomed me in the flat and explained anything I needed to know. There was a small confusion as the address for the listing was referenced with floor 3DTO and the doorbell was actually 3ESQ, that's a small detail that could be updated on the listing to avoid confusion (and avoid ringing at the neighbours in error).
I had a very heavy suitcase so the 3 flights of stairs were a challenge and practically immediately one of the doors on the lower floors opened and an older lady was clearly not very happy with the noise I made lugging the suitcase upstairs. Ana, the cleaner, kindly helped me with my heavy luggage and I haven't seen the neighbour lady again during the rest of my stay but this is something to bear in mind if you expect to come with heavy bags. The appartment was exactly as pictured, very pretty and decorated with love. I enjoyed using the washing machine and drying my clothes "Lisbon style" on the clothes lines in front of the windows.
Catarina, in the kitchen I noticed that the jug of the coffee machine is cracked and that it leaks coffee when it's used. That is something you should probably look at replacing. I have not really been using the kitchen otherwise as food in Lisbon is just too good to be doing your own cooking! : )
The apartment is brilliantly located for partying in the Bairro Alto area, just a few steps from bars with live music and a wide selection of restaurants. On the weekend it was therefore however not really possible to leave the windows open over night as the noise of the party goers is unavoidable. It didn't disturb us too much but if you don't plan to join in to any of the partying, this might not be the perfect place for you. Then again, everyone is different when it comes to noise sensitivity. I live in the quiet country side so do need it fairly quiet to sleep in peace.
Overall Lisbon is just so worth a visit, so if you're on the brink of booking, go for it!