Nevermind, according to this Table and Map from the Governments’ Gazette (and therefore Public Domain) that is part of the Municipality of Iraklio.
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Thanks. I moved the borders accordingly, including the postal code 15122 and the neighbourhood of Psalidi. It will take some time for the results to propagate to Nominatim or whatever map the delivery uses.
The northern boundary I mentioned before does not seem to be wrong – possibly there’s a mismatch between cadastral and administrative municipality? However, the block around this building (labeled 240 on the jpg map) seems to belong to the municipality of Metamorfosis rather than Iraklio. I did not touch this though.
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Thank you all for your effort!
One last thing. The area code for Nestoros 40 is not 15122 but 14121, Iraklio. Could you change this please?
You can use the nominatim debug UI to check how the address data is derived. The postal code 15122 originally came from this postal code area (Relation: 8396616 | OpenStreetMap), but that has now also been fixed by @Duja. It will take some time for the changes to propagate.
Also, you may want to add the house numbers to OSM if you have local knowledge, otherwise the house can’t be found directly at all via OSM data.
Postal code assignment in OSM is implemented with a generous use of black magic… 
What I did in that changeset was to move Nestoros out of the postal code 15122 boundary. That should hopefully place it within the realm of 14121, which however does not have explicit boundaries defined, but instead relies on the mentioned black magic in Nominatim.
That black magic is mostly just proximity to the closest object that has a defined postal code afaik. Tagging the correct address including postal code on the house itself would fix all of those problems. (And defining the correct area for the postal code 14121)
Is the postal code 14121 or 14122?
The existing objects tagged with postal code 14121 are all a bit further away
14121:
14122:
The postal code is 14121 for Nestoros 40.
Thanks!
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