Nice, cute and clean place in a central location good for accessing many of the old tourist locations. The apartment was spotless and comfortable and had everything we could need for a stay! The only small nuisance is that the bathroom is slightly cramped and as a very tall person it was hard to fit on the toilet with my knees against the wall but I managed and it should be fine for most people:)
Parking is a pain, we had to park quite far away, but we found this is the case in most places in the old parts of Lisabon! Also be careful with the late check-in as they are quite strict with it, we had to pay the 10€ even though we were only a few minutes late due to car trouble (which we expected since it is clearly written:) but maybe having a lockbox with a pin and a key inside so us latecomers can check ourselves in and so the hosts do not need to wait for us would be a cool addition!
The neighborhood seemed friendly during the day with kids running around and old people barbecuing but at night there were drug dealers on the corners obviously offering and selling drugs to most people who walked by. They didn't seem dangerous at all to me and we saw them at many other places in lisbon but they did make my girlfriend anxious. In any case they probably move around avoiding the police and most likely won't be at the same place in the future. This is nothing against this apartment but more against lisbon as a whole!
On the whole, if we are ever in Lisbon again we would be more than happy to stay here again.