I stayed for two full weeks and had a great time there. There was everything I needed to make me feel comfy and at home. The kitchen was big enough and equipped with all the basics. The bathrooms were kept clean and the showers were nice and warm. Wifi was good. Several power sockets in the room. There's a hairdryer and iron you can use. And location was super central, I walked everywhere from there.
Just a couple of small details to be aware of:
-you have to ask when you want to do laundry and it costs 2 euros.
-bring earplugs if sensitive to noise, both the neighborhood and the apartment itself, which has many rooms, can get noisy.
All in all, I would definitely stay there again when in Lisbon.