Joao's place is right in the heart of the party district. Amazing for bars + restaurants and for exploring Lisbon on foot. It might not be good for those that can't walk far, or those that are very light sleepers. His soundproofing on the door was great, but my partner woke up in the night and struggled to get back to sleep.
It has everything you need even if you want to cook -- it's not a modern place though, just has the basics.
I found that the flat could smell quite damp even with the dehumidifier. There's not much airflow to the bathroom at the back, causing the room to become humid. This meant that the smell permeated the rest of the house during the day. You get over it after a while, but it was a little bad when we arrived. The floor was quite dusty too.