Could not have had a better experience at Hostel 1110. It was a bit of a walk to/from the Gran Terminal del Caribe, but we knew that when we booked our room (plus, SJ is super fun/easy to traverse on foot). The front desk staff is available 24/7 and all staff are *incredibly* friendly. Readily offered us the continued use of the common areas after our morning check-out, which is always a big plus for hostel stays. We stayed two nights on the tail-end of our trip and really enjoyed relaxing on the porch.
Hostel itself was incredibly clean and well managed. Well kept kitchen, functioning appliances, the provided breakfast is HOMEMADE (eggs, fresh cut fruit, toast with spread), not just a selection of pastries/coffee. Beautiful wildlife murals on the walls, painted (or at least the touched up, as witnessed) by volunteer staff.
We had a private room - it was very clean with rotating fan included. Privates are located across the street from the common areas and dorms - access via locked gate. Bathrooms functioned very well, one of the best showers we'd had during our two week trip in the country.
Extremely fast WiFi. There is also a public desktop for guest use. Cold sodas/beers and other snacks were sold at the front desk - we didn't purchase any, but very nice to have on offer and added to the welcoming, well-catered vibe.
Good location - far enough from the busy streets for it to be quiet, but right next to the Chinatown walking mall for quick daytime travel and exploring.