If you like it, buy it. You should also be able to find a low mileage xB. You might also like a used PT Cruiser. A tiny bit larger than the xB (two inches longer), but if you like the room inside the xB, you will love the space in the PT (you can put 8 foot lumber inside). I had one for 18 years. Rear seats remove with no tools, front passenger seat folds down. Bikes fit in upright with room to sleep inside.
I've removed the seats in the Niro, big enough to accomplish what I need (never have passengers), but barely so despite its much longer length. The Niro is less tall than the PT or the xB, with more ground clearance so obviously room inside the Niro is less. But the PT was end of life and I wanted a more fuel efficient car.
There are no direct competitors in Niro's shape. Maybe the CT200 but that is smaller. All models eventually go away but it is only the second model year for the Niro. Niro sales have been good for Kia.
2018 Kia LX HEV Metal Stream with Advanced Tech