Heliodon realistic setting

Hello everyone,
I’d like to create an interior scene illuminated by natural sunlight during the day, avoiding artificial light sources. Unfortunately, I can’t seem to find the right parameters. Either the interior is too dark, or the exterior is overexposed.

Attached are two examples:

  • The first one uses ISO 500 and 32 seconds,
  • The second one uses ISO 900 and 32 seconds,
    and both require a portal.

Can anyone help me achieve better results? Thank you so much in advance!