My wife and I (30 something professionals) stayed in this apartment for just under 3 weeks, a mix of remote working and vacation. Overall this is a fantastic place to stay in Lisbon - the place is spotlessly clean, stylishly decorated and in a fantastic location in the middle of Bairro Alto. All the appliances work well and the dehumidifier was a helpful bonus. Check in was smooth. The apartment had enough space for us to comfortably work and hang out. The WiFi worked well. On balance would have no hesitation in staying here again.
Only two minor points - the apartment is a bit dark with limited natural light. This didn’t really bother us but might some people. The second - the sofa is not super comfortable. To elevate this to a six star place the host could put in a better sofa and arm chairs.