My sister and I visited Lisboa from late May into June. This was my first hostel stay experience, and if this is what they're about, I'm all in!
Karim at Sweet Home hostel is super nice. I reserved the room online, but my card was not charged until I was installed in my room. We chose a private double room, with a private bathroom. Everything was very clean and staff went out of their way to make us comfortable. Karim provided detailed information on the best beaches, restaurants, must-see attractions... he was always helpful, and responded to every email. Oh yeah, there's free Wi-Fi too!
The only drawback is that it's on the 5th floor, so if you have a lot of luggage it's a bit tough to get up there. But again, being that we were two girls, Karim helped us with that too.
Location is ideal, close to shopping, Rossio, all the train stations... Short of staying right in Cascais and hitting the beach daily, we couldn't have picked a better place.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC