The flat is what you'd expect in Lisbon, a small contained little apartment in a good location.
However be aware that this is not a traditional Airbnb. It is a flat ran by a company and there are additional costs due to this so read the house rules section before booking. We booked a non-refundable stay and did not realise we would need to spend an additional 25E for a late check in (after 9pm - we had the late Friday flight). This made it a lot more expensive than other flats in the area for us. If this information had been in the main Airbnb information section, we would have booked a different apartment.
They also use a credit card for a deposit against any damage.