Omar's place is as advertised. It's close to the Gothic Quarter and most of the usual tourist attractions (10-15 minute walk), but also beside the Metro and bus stops if you prefer to take public transportation. The Aerobus A1 has a stop just by the corner (if coming from the airport) and the stop for returning to the airport is a block away. Super convenient!
The apartment is located a couple of flights of stairs up with no elevator (I think?) so just be warned if you're not comfortable with that. It's a clean flat with a comfortable bed and a bit of refrigerator space to use. Omar was very nice and easy to communicate with. He waited for me for the check in despite my flight arriving past midnight. Highly recommended!