Double Chooz is a short-baseline neutrino disappearance experiment. It detects ν̄$_{e}$ produced in the power plant of Chooz, France, where is located. The main goal of the experiment is the measurement of θ$_{13}$ mixing angle and in 2011 for the first time the experiment observed an indication for a non zero value of such an oscillation parameter. The mixing angle was successively measured using only the far detector finding the best fit value of sin$^{2}$(2θ$_{13}$) = 0.090$_{−0.029}^{+0.032}$ . The near detector is under construction and will start data taking by the middle of 2014 allowing the reduction of the systematic errors. In this paper I make a review of the Double Chooz experiment, focusing in particular on the latest results of the measurement of the mixing angle θ$_{13}$ relying on the neutron absorption on Gadolinium. I also present results proving the capability of Double Chooz to identify the ortho-positronium. This has been done in an event-by-event basis for the first time in a large liquid scintillator experiments, and can be an additional handle for the electron/positron discrimination in future detectors based on such technology.