There are some indoor plants that are easy to take care of and can help clean the air in your small flat.

1. **Snake Plant** (Mother-in-Law's Tongue): Great for beginners. It can grow in low-light conditions and requires minimal watering.

2. **Spider Plant**: Easy to care for and can grow in various lighting conditions. It only needs moderate watering.

3. **Peace Lily**: Known for its beautiful white flowers, this plant can grow in low-light conditions and requires minimal watering.

4. **Aloe Vera**: Improves air quality but also has several health benefits. It can grow in bright sunlight and requires minimal watering.

5. **Boston Fern**: Great for improving humidity levels in your home, which can help improve air quality. It can grow in low to medium light and requires moderate watering.

These plants are not only easy to care for but can also help improve air quality in your small flat. They remove toxins like *carbon monoxide, trichloroethylene, formaldehyde, benzene* and *xylene* from the air. They're a great addition to any home!
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