I stayed for 16 days remote working. Good points: The location is very pleasant, Praça das Flores is a very beautiful plaza, and the balcony has a nice view of it. The living room is very spacious and has a nice old cabin decoration. There are flat-screen TVs in the living room, bedroom and kitchen. The wifi is good, I could work and make video conferences without any problem. It is near the Rato Metro Station, where you can make connections all over Lisbon. There is a Minipreço supermarket in the other street corner. The kitchen has all the appliances and I could prepare all the meals without any problem.
Bad points: There is a very steep and narrow staircase to get to the apartment, it is very difficult to access it with luggage, you need to be young and strong. Thermal insulation is poor, so not a good option for the winter. Sound insulation is poor, the entire building floor and staircases are in wood, so you listen to all the neighbour's conversations and steps during the night. It gets worse at weekends, as some neighbours arrive from the local pubs during the dawn. There are no cabinets in the bedroom, in fact, the bed fills all the room and part of the corridor. You have to store clothes in the chest of drawers in the living room. There is a restriction on how many power-hungry appliances you can turn on simultaneous in the kitchen, if you turn on the oven and the electric kettle at the same time the power will go down, which is very annoying.
Besides the drawbacks listed, I still recommend staying if you are alone or a young couple and outside winter, as it offers a good price for money.