Limerick Museum is marked twice.

via StreetComplete 61.3

The first building of Project Opera is finished.

via StreetComplete 61.3

There are some duplicate entries here.
Carlton Café is a bit smaller (towards Thomas Strret); entrance from Thomas Street. Then there is Malt on Little Catherine. It takes the freed up space from Carlton. The entrance is on Little Catherine, at the space that's currently marked as part of Carlton. And finally, a closed cafe before the side entrance to Guineys.

via StreetComplete 61.3

Unable to answer "What is the house number of this building?" for way/706621423 via StreetComplete 22.3:

This is a part of the Glucksman Library.

Unable to answer "What is the house number of this building?" for way/106564946 via StreetComplete 22.3:

This is just a storage shed attached to the Main Building.