If you're looking for a true cultural exchange I would highly recommend staying with Giselle. I stayed with 10 other college students in 4 apartments and our experience was absolutely made by how incredible all of our hosts were. Every morning they made us breakfast and were always around if we needed anything to make our stay more comfortable or if we had any questions about how to get around Havana. The apartment building is conveniently located within walking distance to tourist sights/bars/food as well as the main square by Hotel Inglaterra where we would hail taxis. I cannot overemphasize how compassionate the people who hosted us were and I would highly recommend anyone interested in a homestay experience stay with these incredible hosts!