My husband and I(30-26) booked a week at the Casa Fitz Roy based on the reviews on Tripadvisor.
We were delighted with pretty much everything about our stay there.
The staff speak english and they could not have been more welcoming, or more efficient and helpful towards us.
They were happy to recommend good restaurants in the area and on the morning we checked out, they asked what time our flight was - on hearing that it wasn't until that evening, they said we were welcome to leave our luggage at the hotel until later, if we wanted to spend a few more hours sightseeing before we left Buenos Aires.
The room we stayed in was exactly as described on the hostel's website. Clean, decor, nice cool old pine floor, wood beds with a firm mattress, reasonably priced and working heater/air conditioning.
The bathroom wasn't huge but it was modern, well equipped, the plumbing was modern, and spotlessly clean.
We were suprised by how quiet and peaceful the hostel was, considering it's right in the centre of Palermo.
But we didn't hear any street noise or traffic at all from our room and it was very easy to sleep at night.
We were about 10 mins by metro from the city centre.
Breakfast was served in the dining area . It's self service, apart from coffee/tea/milk/mate, they also had fresh pastries and croissants, toasts, butter, dulce de leche.
You can use an iron and ironing board belonging to the hostel. Little touches like free internet /Wifi ,free inc telephones from europa, for guests .
As the hotel's right in the middle of town(not downtown), it's perfectly located for sightseeing.
Our argentinian family said we couldn't have picked a better hostel, and we agreed
Would definitely reccomend