House geckos lean on the nicer side but of course some can be mean just like any animal(as long as you respect the animal you won't have problems). The thing about house geckos is that they are FAST and they can climb just about ANYTHING.
They need HIGH humidity(50-70%) and they NEED UV lighting, just like anoles. A red infrared bulb for nighttime heat(and visibility

) is a great idea, along with a UV light going on 12 hours during the day. Temps during the day should be 78-85, and a 5-10 degree drop at night is perfect.
If you want a new pet you should be looking at proper care and husbandry rather than temperament. But remember that they are tiny and FAST.