The positives because it has been serving continuously and qualititatively the neighborhood for years on a row, with good teachers and a solid tradition of not changing them often (uncharacteristic of the specific inductry in Greece). The negatives because the Owner has skipped both considerable opportunities to expand and has neglected valuable advice from many sides.
I would tell them "Do, come!". The quality of teaching is good and the level of support both for the students and the parents is the highest.