This is the best hostel I've ever stayed at by far.
I stayed here for 3 weeks. The staff are AMAZING; whether it's Anya going to the hospital with you when you get sick, Eddie making you dinner and sangria or having awesome conversations about life with G, these people are there to make you feel welcome.
As for the hostel, it's super clean with friendly vibes, lots of cool people and very secure. You feel perfectly safe leaving your valuables here while you go out and explore Lisbon. They also have free walking tours every day and quiz nights, dinner nights, sangria nights. The BEST!