We just returned after a 6 day stay at Hacienda Mariposa. I loved the staff at the front desk but also in the restaurant, who tolerated my request to purchase 2 cervezas when it was too late on a Sunday to buy at a store. We drank those beers on the communal balcony looking over 5th av for an early night in. The room is very clean and subtle gestures like the soap-display in the bathroom, made it feel simply classy.
We had a standard room and it was just that: very small, one bed, a TV, fridge, AC, safe, closet, and a bathroom. As all of the other users have noted, the hotel is noisy at night because it's above a restaurant on the main strip. The noise didn't bother me because I was expecting it and I'm generally ok sleeping through noise. My partner brought ear plugs to sleep. The beds are hard as boards: not good for someone like me with sensitive hips. But my partner loved the bed: to each their own. The biggest con for me is that there is no wifi IN the rooms: I felt disconnected from home, wondering if I was missing calls about my dogs, family, etc... but, I was able to connect to the wifi if I was on the side of the bed nearest the door, near the communal balcony.
The restaurant has amazing pizza and guests at the hotel get 50% off--which is an excellent deal considering the cost of food on 5th Av. is outrageous (we learned half-way through our trip to walk a few blocks off the strip to find regular-priced food--check out Constituyentes y 20th--30th Av).