Had a great 4 night stay at Juan's place near Barrio Alto. Location was awesome, short walk to bars/restaurants near Barrio Alto/Chiado. Very quiet surrounding area.
Looked just liked the pictures - everything was very clean and modern. As a remote worker, WiFi was exactly what you need - video calls, high tech, etc.
Juan was also very responsive and flexible. I would love to stay here again on my next visit to Lisbon. Like many other review of this apartment, it is quite a climb to the top floor as a heads up