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.