Which stars have I been seeing?
My interpretation would be that these are the planets Jupiter, Saturn and Mars.

The bright star is Jupiter. It is rather lower than 20 degrees above the horizon, it is at about 10 degrees, but rising.  The two other stars, one brighter than the other are Saturn (brighter) and Mars.  Mars is really red, Saturn may be reddened by being low in the sky.  Saturn is about 5 degrees East of Jupiter and Mars is a couple of degrees more.

To get your bearings, locate the "summer triangle" of Vega, Deneb and Altair. This triangle (currently) points towards the area containing the three planets. (Draw a line between Deneb and Vega, and through Altair and continue on a great circle in the sky)

I used Stellarium to view a simulated sky from Eindhoven at this time.