We stayed with ET for two months in the summer. We really liked the location (really nice to bike into town or the bike paths and stroll to ice cream). The space was very clean and great for a couple like ourselves. If you are passing through Bozeman, we can't recommend this place enough. ET has lots of knowledge about the area and loves to give local suggestions of places to go. Similarly, if you are looking to stay long term and don't like to cook every night, this is awesome.
We do like to cook every night and found some of ET's kitchen use rules to be frustrating. For instance, there is no cooking for guests on Sundays after 3pm and if you fully load the dishwasher, she gets concerned about it being stressed.
Also be aware that if you have friends in the area that you would like to have over for a drink, you must give ET 24 hours notice, and no overnight guests are permitted.
ET is very generous in providing new items to enhance your stay (the AC was especially appreciated), but be careful as she will expect them back in "new" condition, so you are on the hook for a new one even after minor cosmetic scratches.
Overall, this is a great place to stay, especially if you plan to lightly use the shared spaces in the house.