My girlfirend and I stayed at Chelo's place for a week. We met Chelo's friend as Chelo was not there to greet us. She was lovely and showed us many places to visit while in Seville.
The location of the flat is excellent. You are within walking distance of all the sights. We only needed public transport from the airport to the flat. There are also many bars and restaurants nearby serving great food.
The flat has everything you need for two people. The air conditioning is excellent and it is very quiet at night as it is on a side street. Our only issue with the flat is the bath does not fit a fully grown adult. The bed is also short but otherwise very comfortable. We would happily stay again.