While the limited sensitivity of standard spectroelectrochemistry may be problematic for the investigation of thin films with few nanometer thickness, Hickey et al. introduced potential-modulated absorption spectroscopy (EMAS), which is sensitive enough to study monolayers of CdSe quantum dots. Using EMAS, DPV and electrochemical gating (ECG) experiments, we present here the electronic structure of colloidal 2H-MoS2 nanosheets with a thickness of 1-2 monolayers and lateral size of 20-25 nm. We demonstrate that the novel wet-chemical pathway affords 2H-MoS2 nanosheets of the same quality and unique electronic features as those previously described for 2H-MoS2 films obtained by liquid exfoliation, namely a direct bandgap, intrinsic n-doping as well as strong bandgap renormalization upon doping. We determine the exact energetic positions of the band edges involved in the direct transition as well as those constituting the indirect transition in bilayers. We find strong indications for two distinct band nesting transitions and report the energetic position of the points in the conduction band edge involved in these. While oxidation of the 2H-MoS2 is irreversible, we observe a mostly reversible reduction even for potentials far above the conduction band edge, rendering this material suitable for reductive electrocatalysis, e.g., for electrocatalytic hydrogen evolution.