First, get WeChat and set up your credit card for payments. You can hardly use international credit cards in China. Cash was King but now all WePay or AliPay. Secondly, download DiDi and set it up with international credit card. Easier to use DiDi to input addresses in english and order taxi as no taxi driver speaks english. Buy a data plan before you come to China. use it wisely, you can upload photos to Instagram and Facebook, etc. when you are back home or at hotel using VPN (i recommend Astrill but ExpressVPN also good).
Always, always avoid people on the street selling you tours or bringing you to teahouse or KTV or whatever. You have no idea what you get into and you'll be easily ripped off. If you want support, order from a tour operator, the hotel or just order a your own driver.
BeijingWell, here I lived for like 13 years before moving back to Sweden 6 years ago. But have been back to Beijing at least 50 times since moving out. My part of Beijing was East Beijing, centred around Worker's Stadium and Sanlitun. And it's fairly pleasant part of the town, used to foreigners and life is easy around that area. Some tourists but more business travellers and 'locals'. Subway should be used if you can, predictable as Beijing traffic can be anything but fast..
Here's a Google Map (need VPN or your international phone to access) with most places listed below.