Achat Hotel Corbin München Airport

We are leaving the hotel at the moment and we are very disapointed from the staff, room and hygien.We were staying in room sized 10 square meters for 7 nights, which is actually in the basement with no ventilation. Previosly when we booked the room we mentioned that we are two adults and one child and they told us total price for eight night is 932€ but when we came on the reception we were told to pay immediately 1060€ as we did. We had to check out earlier one night cuz of the sickness of one of our familly member and they did nont refund our money for that night. When we walked in the room it was very bad smell and the receptionist told us to let the hot water running in the bathroom and we did it but after 10 minutes the bad smell has appeared again but the receptonist deny it, she said that she does not feel any smell. We had to stay for eight nights in very dirty and bad smelling room with full of spider net with our child. We told reception to send someone to clean the room but they came only once in all 7 days stayin in 10 squear meters in the basement with no ventilation with our child. I do not reccoment anyone this hotel because the stuff is not doing their job at all and thats why the conditions of staying is very bad. If it has -0 evaluation for this hotel i would give it.