Nice apartment and pretty central - you can reach the Alfama or Baixa Chiado by a 30 mins walk or you use the metro station very near to the apartment.
It is a bit old but the kitchen is alright (some more cutlery could be added) and there are three bathrooms. You share the apartment with others but it never created any problems. All in all a nice stay. Host should add a telephone number so that you are able to reach him in emergencies.