My chihuahua, Skylah, is a lovely and friendly dog who needs a lot of love and affection.
For me the most important thing is for her to have a comfortable space inside and is not left alone for more that 5 hours. But if she is alone she isn't comfortable around other big dogs as she can get hurt if they try to play with her (due to her size and age).
She loves sleeping on your lap and doesn't require a lot of physical activity (one twenty to thirty min walk every day or every second day is enough)