we had a great time in Tiago's apartment. The rooms are spacious and clean, the kitchen and bathroom are very fine. The location is only a 5 min walk to the train/metro station which makes the Lisbon city centre but also the websummit within a 25 min reach.
Tiago's cousin welcomed us and did a short and effective presentation on the apartment specifics including how to swith the gas supply. Be aware the apartment does not have a heating (like most apartments in Lisbon) so take a sweather for evenings in the winter