I've been staying at Loi Suites for years. I stay there because it's the best value for the location. I also like that the rooms have little kitchenettes (small fridge, microwave, oven, stove). The staff is very attentive. You can't beat the location, it's super-accessible to everywhere, via taxi, walking, or bus. Blocks away from shopping and a couple of really nice malls.
The rooms themselves are in need of new carpet, but they are always clean. I paid $78 per night by booking from my mobile phone (didn't use the app, just booked from the regular website from my phone. The staff is wonderful - typically Argentine. They are always willing to let you check in early, since international travelers almost always arrive in the morning. Don't expect 5 star hotel service, but there is always someone available. Breakfast is excellent. When you leave on an overnight flight, it's worth it to go ahead and pay the extra day at that price, so you can stay in the room until 5 or 6 pm. Otherwise you'll be one of about 10 people hanging out in the lobby all day until time to leave for your flight.