We had no problems with cheking in and out. Daria and her family were really nice and always approachable.
We had the opportunity to checkt out later and to leave our bags their if we wanted.
The subway is a five minutes walk away from the apartment and not hard to find.
The apartment was as described, we only missed a real heater, since it was really cold. There was only a plug-in heater, which had to run a few hours to make it cozy.
That was the only thing that bothered us about the apartment, but I don't think it is a problem in warmer months.
We can definitely recommend the apartment and Daria as a houst!