I'm pretty sure the postbox is across the road at the post office (house nr. 1)

Forwarding anonymous report from #Mapy.cz user, please verify: Parking is paid.

way/79654484

Address: Sæmundargata 12

Have been demolished. So can be deleted.

"questo è il punto giusto dove si trova questa guest house, bisogna togliere l'altra vicina"
POI has no name
POI types: tourism-guest_house internet_access-wlan
OSM data version: 2018-05-12T22:49:02Z
#mapsme

onosm.org submitted note from a business:
name: Árbæjarbakarí - Reykjavík Bakarí ehf.
phone: 5577660
website:
twitter:
facebook:
email: [email protected]
hours: Mon - Fri 7:00AM-5:00PM, Sat 7:40AM-4:00pM, Sun 8:10AM-4:00PM
category: Bakeries
address: Hraunbaer 119

Forwarding anonymous report from #Mapy.cz user, please verify: There's a waterfall.

Need to finetune this part with newer imagery, many buildings in construction

Unable to answer "What kind of building is this?" for way/220769296 via StreetComplete 47.1:

There is nothing there, only a car parking lot for workers.

"Moved"
The place has gone or never existed. This is an auto-generated note from MAPS.ME application: a user reports a POI that is visible on a map (which can be outdated), but cannot be found on the ground.
POI name: Ullarkistan
POI types: shop
OSM data version: 2018-04-17T05:20:02Z
#mapsme