The 70D is the previous model in Canon's "prosumer" line. The current model is the 80D. The current prices on Amazon for a new 70D and 80D with 18-135mm lens are only about $150 apart ($1200 vs. $1350). If that difference isn't a big problem, I'd opt for the newer 80D -- the extra money is a good investment in a camera with somewhat better features and (more important) a longer supported lifetime. But if someone is offering you a really good deal on a new or gently used 70D, that camera won't be a bad choice at all. In short, the 70D is fine, and the 80D is somewhat better.
The kit lens will be fine for your needs. Kit lenses at this level are usually of good quality and meant to make the camera as useful as possible without requiring further immediate investment. If you really get into photography a day will come when you decide you want to expand your lens collection, but the 18-135mm will definitely get you started and serve your needs for a long while.