The church of Panagia Zerviotissa (i.e. left-handed) or Monastira is located east of the village Stylos, province Apokoronas. It is a 12th-century cruciform temple with an octagonal dome, each dome bearing a window on each side and supported by four pillars. The ground plan resembles a three-aisled basilica with three semi-cylindrical arches.
The external surfaces host blind arches. On the west arch of the south aisle there is a rectangular door with a relief arch, where part of a Roman inscription is embedded. There two-lobe windows, while the two lateral arches bear single-lobe windows. The temple was frescoed, as can be seen from the few surviving traces.