A few years back I shot houses for Airbnb, and for the interiors I used a 12-24mm Pentax lens on my K20D. You may be able to hire a similar lens. Your 16-45 will probably be just the job for the exterior shots. I don't know what experience you have but this is how I did it:
I shot at 400 ISO, first adjusting the exposure manually so that nothing was blown out to white from sunlight coming in the windows,* then adjusting the fractional power setting of a big old manual flashgun for fill, and bouncing off the (usually white) ceilings above my head. Once in a while I had to use a 45 degree bounce card for the flash because of the building layout. Auto White Balance worked well. I lined up the camera with the verticals by making use of the edge of the viewfinder and the lines on the screen that showed where the AF points were.
I focused manually, having made a depth of field table for various focal lengths and f/5.6 to f/11, plus hyperfocal distances, which certainly aren't very distant at 12mm... Here's a link to the depth of field calculator I
used.
The only thing I would have done differently would be to sometimes use a remotely activated second flashgun, where another part of the room away from the camera or round the corner could do with more light. I used to take most few photos from a bending or kneeling position, concentrating on what's in the lower part of the room rather than the ceiling, and of course keeping the camera level. I didn't use the tripod once, because you can't get into the corners with it.
Keeping the camera square and level to the buildings is the way to go indoors, but outside the smallest bit of upwards tilt looks more natural. If the side of the house you want in your photo doesn't get the sun on it at all during the day, take the photo when an adjacent side is in the sun; only thing you can do. Any interesting details you find, take a close up. I don't know how big bathrooms are in your part of the world, but they are pretty small over here. You might have to take your shoes off, because you'll be taking a photo from the shower tray or the bath.
*Actually Airbnb required things to be rather overexposed; they liked a very "bright" and airy view. All very well, but I believe that blowing out the highlights is a step too far.