I stayed here for four nights, paying about USD25/night for a double room (single occupancy) with private bathroom. I cannot stress enough the importance of paying with actual US cash, not pesos; it doesn't matter if you're not American, bring USD with you. (This is probably good advice for visiting Argentina generally; search the web and make up your own mind.)
Assuming you do pay in USD, the hotel is exceptional value for money (by Buenos Aires standards). The location is excellent, walkable for many tourist attractions and not far from a number of Subte stations if you wish to go further afield. It is about a fifteen minute walk from Plaza de Mayo so cheapskates like myself can take the number 8 bus from the airport when they arrive - it takes about 2 hours but costs under 10 pesos, though you must pay with coins (or find a friendly local who will take cash from you and pay with their SUBE card on your behalf).
The catch is that the hotel is decidedly shabby. The paint was peeling off just about everywhere in my room, the ceiling was dirty, the plastic handles on the wardrobe were smashed. However, it is clean where it matters - the bed, toilet, sink, bidet, floor and wardrobe were all spotless and there were no signs of any vermin. The bed was a bit saggy but I slept OK. The room had no air-conditioning but there was a ceiling fan and an openable window, and I found that adequate.
The tiled floor was a little treacherous after showering; be careful!
The wifi was hugely variable. I always got a good signal, but some days it worked well and other days was so slow as to be essentially unusable even for basic web browsing; at these times it was just enough to allow me to send e-mail using an app on my phone.
They let me leave my bag during the day after I checked out.
I can't rate this hotel any higher than average overall just because of the physical condition of the room. I am rating it average for cleanliness because it is clean where it matters, and top marks for value for money.
For travellers on a budget who don't fancy a hostel - I do stay in them sometimes, but after my long flight from the UK I didn't want to go straight into a dormitory - this is a good option. I would definitely consider staying here again on a future visit to Buenos Aires.