Improve data repr and fix notebooks

[sandorkertesz]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/1.0.0rc0@644df15). Learn more about missing BASE report.

Additional details and impacted files

@@                 Coverage Diff                 @@
##             release/1.0.0rc0     #924   +/-   ##
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  Coverage                    ?   82.38%           
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  Files                       ?      218           
  Lines                       ?    14881           
  Branches                    ?      718           
===================================================
  Hits                        ?    12260           
  Misses                      ?     2400           
  Partials                    ?      221           

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