Looking forward to the @insideoutlet express transportation service, it would make it easier to work and travel between Europe and Australia... however, the downside could be that the parents might visit more often!
I guess you would have to know pretty well the place that you were teleporting into, you wouldn't want to materialise into a new wall or something like that... I guess you wouldn't need to taken into account the fact that the Earth has rotated, and moved around the Sun, and the Sun has moved around the Milky Way core, and the Milky Way has zoomed around as well...
Haha that would definely be a downside, but you would never have to worry about going to the neighbours in your pj's for that cup of sugar, just transport to mums and back. As for the rest, yes it would be important not to place yourself into a wall but I think you are getting to complicated with the rotation of the earth etc. I am sure my super power would already account for all of that. lol..