Ofzerna, If you are traveling within the United States, we have found Holiday Inn Express to be very accommodating with roll-in showers and larger room. The Hilton is also a great choose. When making your reservations online make sure to update your customer profile with specifics of what you need such as roll-in shower. Might I suggest you consider renting an AirBnB, which would give you more room to get around.
International lodging is another story all together. I’ve just spent the better part of 4 months trying to arrange accessible lodging for a trip to Europe. I ended up renting 2 AirBnB’s and a hotel where I was able to acquire a room on the street level. This did take sending an email to the hotel explaining my situation. There are many companies that will assist you with booking accessible travel, including lodging, tours, transportation. One such company is sagetraveling.com. Best of luck on successful travels.