This is a very nice hotel, clean, quiet, helpful staff. Coffee at breakfast the best we had in our month in Argentina. This was the fifth place we stayed in Argentina, including two resorts, and it held its own with them.
The location of the hotel can't be beat. SubTe right out the front door gives you access to nearly the whole city. Buses that come by frequently (and for only $1.25 pesos) can get you where SubTe doesn't yet go. SanTelmo is walking distance. Always something going on down the street in Plaza de Mayo, and always sales on Florida Street 3 blocks away. On Sundays, start on Defensa/Peru Street and walk the 1-1/2 miles through the street artisan sales to free tango at Plaza Dorrego in the late afternoon.
Only one caution. We booked in for a 3-night special at $340 US*. It included a city tour (which was very good), a bottle of wine (delicious), and a tango show (which would have been very good, I think, if it had been at Senor Tango as expected, but due to overflow there, we were sent to 'Sabor a Tango', too touristy, too expensive for drinks, and lousy view of the stage. So if you take the special, insist on Senor Tango). *If I understood the regular room rate, the special does save you some if you plan to do these extras anyway.
As for tango shows, two doors down is the famous Cafe Tortoni (a cool enough place anyway) which has an excellent tango show for $100 pesos (~$25 US) and the Hotel Hispano staff can direct you to a bus to go to Caminito to see good tango up close while enjoying reasonably priced drinks and food.
If you don't like Gran Hotel Hispano, you might be just a bit too picky.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC