Union Square stay on a budget
Touchstone hotel is a good choice if you're looking for a decent, cheap place to stay around Union square for a few days, assuming you'll be on the road most of the time.. Small but clean room, the wi-fi can be tricky and breakfast is served at the coffee place right next to the reception. There is also a 24h restaurant at the corner and quite a few other options in the area. Parking is around the corner, but don't forget to ask the friendly reception to stamp your receipt, 
so you can get a discount. I saw many people mentioning here the homeless people around, but I can tell it's not really a shaddy or threatening concept, just some poor, homeless people walking around and sometimes asking for a quarter. Nevertheless, good value for money in Union square.