I am a Human Research Science Coordinator and coordinate scientific studies on ESA ground platforms (parabolic flights, isolation and confinement, bedrest, radiation, topical teams) and on the International Space Station.
ESA has wonderful conditions: the office conditions, equipment and software available to work are of good value and allow efficiency and quality work. The facilities are one of the kind, from the sport centre (with cafe/bar, clean facilities and many kinds of sport and classes available, including football fields and a pool) to all clubs available for leisure (sailing, golf, football, photography, art, etc). There are three also canteens available, all with complete meals and many options for all diets. The location is close to the beach (10min walk), which offers the opportunity for nice walks outside of office hours. The employees are pleasant and share passion for their jobs, which creates a positive work environment.

I'm an Attitude and Orbit Control Systems engineer based at ESTEC.  I support the development of the satellite subsystem that ensures it points in the right direction for science, communications, power or manoeuvring to change it's orbit. 
Working at ESTEC provides for great variety. One day you are helping design the concept for a mission to Neptune and the next day you are in a mission control room solving problems that may arise during the launch and early operations of an ESA satellite. 
Telespazio is very well organised with extremely friendly staff and competitive salaries. The company provides the right balance between providing prompt assistance when needed but without requiring overbearing administration work from its employees.