Stayed three nights in Margana Palace (both upstairs and downstairs apartments). Space and location of the property was excellent. The apartment is right in the center of Rome and close to all of the big attractions (5 minutes from Venice Square), but located in a quiet little piazza so still nice and quiet at night
Unfortunately the one big issue is that there is only real air conditioning in the upstairs apartment. Downstairs has “floor air conditioning” that only makes the floor tiles cold - it doesn’t actually cool the apartment (no air circulation). Also, the floor conditioning mixed with the hot air in the apartment creates a layer of water/condensation on the tiles that makes it very slippery and dangerous.
Overall, the upstairs apartment is much better than the downstairs apartment so I would only recommend staying in the upstairs unit they install real air conditioning downstairs.
However, I would note that Roberta and her team were very nice and kind and tried their best to make our stay as comfortable as possible (we recognize it was difficult to fix the air conditioning situation for downstairs in the short period of time we were staying). They also helped us arrange a private chef dinner (for a group of 17) on our final night on the backyard patio which was wonderful and one of the highlights of our trip.