This is the 11143rd most frequent Russian word.
гостиничными
"Hotel-related" or "pertaining to hotels."
The word "гостиничными" is used as an adjective in instrumental plural form describing "удобствами" (amenities), indicating that the amenities are related to a hotel.
Мы наслаждались гостиничными удобствами во время путешествия.
We enjoyed the hotel's amenities during the trip.
Here, "гостиничными" is an instrumental plural form of an adjective modifying "условиями" (conditions), suggesting those conditions resemble those typical of a hotel.
Для конференции были предоставлены залы с гостиничными условиями.
For the conference, halls with hotel-like conditions were provided.
In this context, "гостиничными" describes "стандартами" (standards) in the instrumental plural, referring to standards associated with hotels.