Visited Lisbon with my girlfriend and got a minimalistic, but very practical private room in Gonçalo's apartment. The location was great; with metro, tram and bus stops very close by.
Initially we were worried about the shared bathroom and kitchen, but these worries were unfounded, as the facilities were kept nice and clean.
Overall, as far as private rooms go, we would recommend staying in Gonçalo's apartment, because the cost of stay was fair as well.