Casco Viejo For Sale Apartment: Beautiful Jerónimo is locatedat the crest of Calle 10ª and B Avenue, steps away from some of the best restaurants and hotels of Casco Antiguo. Apartment N. 3 is located at the back of the building, where it has a small balcony. If you are looking for a two bedroom unit with privacy, this is it! Unit No. 3 will feel like you are in your own world… but yet steps away from everything.