I really enjoyed my stay at Selina Salta. I stayed in a private room which was very spacious, clean and so nicely decorated. It had a TV, fridge and nespresso machine. The shower was hot and food water pressure. The bed was very comfortable.
Location is excellent - a short walk to restaurants and the central plaza. I felt safe as a solo female traveler.
Wifi also good and nice shared spaces (outdoor area, kitchen).
The staff were so helpful throughout the stay. They can help with booking tours. However, I ended up booking tours with a different travel agent (Tiamar) as they offered English speaking tours on some days, whereas the hostel didn’t so much (not uncommon).
The only downside was that it’s right next to a Peña (a cool local restaurant/bar that has a folk show every night). Great if you want to go and experience the culture, but I can be quite loud until the show ends at 2am. If you’re on the side of the building next to the Peña (which I was), you’ll be able to hear everything. Ear plugs helped!
Overall, I would recommend but perhaps ask for a room on the opposite side to the Peña!