I’m speaking as a professional photographer, full time (still!) since 1986. Any Canon, Sony, Nikon DSLR of the past 15 years, or any mirrorless camera will do you well. But it’s the camera operator who is using the hardware that makes the difference.
After the staging, interior photography is ALL about the lighting. This is where experience and lighting equipment will make the difference.
If you are going to take on the task yourself;
Avoid extreme wide angle shots. Those look cool, maybe, but do not honestly represent the subject. IOW, be true in what you show.
Use a tripod. Yes, it stabilizes the camera but tripod use also allows the framing to be perfect and not fixed later.
Ditch the on-camera flash. It’s not real, is lame flat lighting and looks like Uncle Bill did the photography of your lovely BnB.
Having said all that, you could go in to your fully prepped BnB early morning or late afternoon, turn on all the lights and have at it with your cell phone.
Don’t make numerous shots without changing something, the lighting, your angle of view, etc. And DO keep horizons level and verticals plumb.