Qinux Watis portable heater — user impressions and a couple of questions

Hello, I bought a Qinux Watis portable heater online recently and, as a general user, I am fairly satisfied with its performance in a small room. The unit is compact and the controls are easy to use. I have two brief questions for others who own one: did you notice any plastic smell the first few times you used it, and if so, how long did it last? Also, any practical advice on placement for more even heat distribution or on running it overnight? I prefer concise, practical tips—thanks in advance.