The flat is very well located and most of the sights are within walking distance. The Baixa-Chiado metro is very close, so you can easily reach sights further away.
Unfortunately, the flat is also located in the party zone of Lisbon and therefore there is a lot of noise from partying and drunk people all night. In addition, every night during the week at around 3.00 am, the rubbish collectors came by with their trucks. It was impossible to sleep before 5.00 am. The area around the flat is quite dirty and it stinks massively of rubbish. This is mainly because of the party people at night.
The flat was clean and has plenty of space. The shower and the bathroom are OK. Especially the water pressure in the shower was very good and we never had to take a cold shower.
Unfortunately, the furniture is very worn and the fridge almost fell apart and did not close properly either. This therefore had to be handled very carefully. From our point of view, it should be replaced urgently. However, the coffee machine (we are heavy drinkers) is top notch and the coffee was tasty. Unfortunately, we could not use the light in the living room (defective switch or fuse). However, this did not bother us too much.
The communication with Upperground worked perfectly and without any problems.