Königswinter-Margarethenhöhe in the mountain area is a good headpoint for many hikes through the Siebengebirge. There is a parking lot and a bus station of the line 521.
Mount Ölberg (468 m) is the highest of the Seven Mountains. When you come by car over the A3 Autobahn (motorway, interstate) or over the Kennedy bridge in Bonn, you see it already from far.
The Rosenau is situated in the middle of the Siebengebirge between Nonnenstromberg and Ölberg. Coming on the hiking trail that goes all around Mount Ölberg (Ölbergringweg), you will see the signpost “Aufstieg zur Rosenau”, ascent to Rosenau.
I love Mount Lohrberg. Agreed, his “neighbors”, Mount Löwenburg and Mount Ölberg, are better known, and there is neither a castle ruin nor a hotel here. But the Lohrberg has its very own magic.