This is a great wee apartment in an extremely central building (yes, up 4 flights of stairs - great exercise!)
Erasmo made us feel very welcome and was a very quick communicator whenever we had questions for him.
The flat has everything we needed - basically somewhere nice and quiet to crash after sightseeing the hell out of Lisbon. The location was wonderful as we always knew how to orient ourselves (it's 2 streets over from the main square) and it was an easy walk to Bairro Alto and Alfama, both of which you'll want to visit (highly recommend free walking tour of Alfama), as well as the central shopping streets.
I'd definitely recommend this place, and Erasmo as a host.