I recently stayed in the Poznań apartment by Renters and had a mostly positive experience. The space was spotless, spacious, and very well-located - perfect for exploring the city. The mezzanine sleeping area added charm, though the stairs felt a bit unsafe due to a wobbly handrail.
One small downside was the lack of coffee pods for the provided coffee machine, and I couldn’t find suitable ones nearby. Despite these minor issues, the apartment was comfortable and clean, making it a solid choice for a stay in Poznań.