You should come to metro station "Chehovskaya".
From the glass door of metro station, you should turn to the left, pass small shops, then upstair and you will be near the building with an arch and advertisement "Venice" (Венеция).
Also you can see drug store 36.6 and yellow shop "Евросеть"
You should go inside of this arch and pass about 100 metres,after the 3-d arch with name "BEER №1" (after Subway) you need to turn to the left and then you will see billboard "OASIS" on the door.
Press the button "OASIS" on the door and the second floor.