Watering - winter once a week. Summer every two/three days. There is a drainage.
Light - approximately one meter to side from a balcony window with a curtain. Window located to east-south.
East Slovakia - inside from 20-26 degrees.
Life - we have it around half year. 2 leafs grown since the purchase.
Pests - not visible.
You are watering it way too much. Monsteras need to need be soaked then allowed to completely dry out between waterings.
A larger pot allows for less frequent waterings. I only water mine monthly in the summer. Every 2-3 months in the winter.
They need fertilizer especially when putting out leaves. Yours is showing nitrogen deficiency. It’s a bit of a weird expression but monsteras are unique.
Light levels - they do best with 3-4 hours of direct sunlight every day. Generally it’s best to have those hours in the morning or evening.
Thanks for the advices. You might be right with watering. Will try to repot it, and be more careful with watering.