The unit is on the 3rd floor of a restored building in the outskirts of the Alfama neighborhood. It is walking distance (10-15 minutes) to the city center. It is on a street where the famous tram rt 28 is passing through - so you can take it if you prefer it over walking.
The place itself is on the top floor of the building. It is very nicely restored and has all the modern amenities. We were 6 people and we had a lot of space. There are amazing views to a nearby palace and a church, and a view of the river.
We had a wonderful time at the place, and the hosts were super helpful in recommending places to visit and places to eat (even for our other places we went to, like Porto and Sintra).