I had a wonderful stay at Carolina and David's! I was visiting from Boston for a conference at the convention enter. It's a quick walk with a nice coffee shop en route (compass coffee - much better cappuccino than the Starbucks at the center). The room is very clean and the building is very secure (however, while the neighborhood is definitely up and coming, it's still not the safest late at night. Nothing too concerning though, just like any city).
I'm originally from DC so I used my conference as an excuse to see friends, too, so I was barely in the room and unfortunately never got to meet David or Carolina. However, we kept in touch all throughout my stay to make sure I was comfortable. They even went out and bought heaters for the room after I let them know I was cold! They were beyond accommodating and the place is just beautiful! Will definitely be staying here again next time I have a conference at the convention center!