Add hotel
name=Coco-Mat Hotel Athens
address=Πατριάρχου Ιωακείμ 36
rooms=39
website=https://www.cocomatathens.com
phone=00302107230000

Also add node:
amenity=restaurant
outdoor_seating=terrace

For the building:
architect=Εμμανουήλ Λαζαρίδης

1ο Δημοτικό Σχολείο Πεύκης

building name=“Μέγαρο Πολίτου”

node:
restaurant, operator=ikea, level=3 or 2

Change:
-building=yes -> building=school
Remove:
-construction tag

"ζΛόντου": πιθανό τυπογραφικό

This is a pedestrian street

Add hotel
name=Zillers Boutique Hotel
address=Mitropoleos 54
phone=00302103222277
website=https://thezillersathenshotel.com

For the building:
levels=2
architect=Ernst Ziller
architect:wikipedia=en:Ernst_Ziller

Add node:
amenity=restaurant
outdoor_seating=terrace
level=3

church

Only the base of the memorial (not monument) "Mnimeio Afanous Nauti" is left here.
The big cross is an accompanying artwork of the memorial that could be tagged with man_made=cross (+ material=concrete) and/or some other artwork keys.
Interesting story in Greek here: https://pireorama.blogspot.com/2012/02/blog-post_20.html

Οδός Καρμανιολών