We stayed at the Blue House for to nights. The location is very good, right in the centre. Close to the metro and train to Belem. Wifi was good. Communication with the host was very smooth. The apartment is nice and spacious.
Worth noting is that it's on the top floor with no elevator. There's a lot of nice from the bars in the evening. I sleep with earplugs so it didn't bother me and my company wasn't bothered either.
Overall good value for many and a good central location for discovering Lisbon.