Low-mass M-dwarfs originally have not been in the focus of exoplanet search 30 years ago. Exoplanets orbiting low-mass M-dwarfs, however, are the short-cut towards rocky planets at habitable temperatures and therefore significantly gained attention, over the last decade at least. For some M-dwarfs, we now have a large amount of radial velocity measurements over a long timescale. This allows probing (sub-)Earth mass planet and planets within or outside the habitable zone of those stars. Deviations from Keplerian orbits can also be detected in some cases, allowing the investigation of the planetary architecture, namely deriving a mass and inclination also for non-tranisting planets from the plant-planet interaction. An overview of recent results for nearby multi-planet systems will be presented.