I had a very nice experience with Free Hostels, visiting Rome for a couple of days. There was a nice, easy and welcoming check-in, including a free welcome drink and the option to join dinner with other guests for a small price.
The courtyard and bar was a nice place to hang out and talk with other guests, and there is a large kitchen with access to basic kitchen utilities, fridge etc., if you choose to cook yourself.
The rooms were shared (unisex), but with good opportunities to keep your private items in personal cabinets and close curtains or sliding doors for some privacy.
All in all a very good experience for the price and social options and welcoming hosts.