This is a beautiful, clean, well equipped apartment, with views over the mouth of the river (from a certain angle). Pedro gave very clear information before arriving about how to get to the apartment building, then how to access the building and apartment.
It is located on the edge of the old city, but everywhere is easily accessible, by walking (remember that Lisbon is built on 7 hills, with the apartment seemingly near the top of one of them!) and public transport (the metro in particular is extremely easy to navigate). When we had a question about how to get the heating working (we visited over New Year) Pedro answered the phone immediately and explained clearly over the phone how to sort it out.
We had an amazing time and we would gladly come back to this apartment, if it is free, for our next trip to Lisbon.