As a freelancer I've worked in lots of different offices, and working in tech lots of companies tend to invest quite a bit in the office space
The most recent office I've worked in absolutely smashed it:
Fridge with free cans of soft drinks as well as lots of herbal teas and proper coffee (nice fruity drinks like Cawston and San pelligrino as well as diet coke etc)
Freezer full of mini ice creams to help yourself to in summer
Fizzy water on tap (I love this a ridiculous amount)
Booths for phone calls so you don't have to take up a meeting room
All meeting rooms bookable via our Google calendar and can also take a free meeting room using the iPad system outside, so people can see it's booked if you hop in for 15 mins. I can't remember what the system is called, but it's got a slack integration so you can just ask the slack bot if there are any rooms free 
Big workshop space with tonnes of wall space and whiteboard walls to leave stuff up for collaborative working
Every meeting room is fully equipped with whiteboards, boxes of post its, sharpies etc and magnetic things to clip up stuff to the wall without using blu tac.
Built in cameras and chrome cast in each meeting room with the big screen for easy Google hangouts for video conferencing
Lots of breakout areas of different sizes - sofas, small tools and tables etc
PROPER DESK SETUP
Fully stocked stationery room with all the right stuff always there. Good quality stuff - I've worked in places where designers brought in their own sketch pads and pens etc as the office didn't supply decent quality materials
Beer fridge on Friday (which means prosecco trolley) and nibbles
Cheese and wine Thursdays
Breakfast laid on Friday morning
Really great company to work for and as a freelancer I've worked in a few!