We have stayed at many historic hotels in the past and make a point of spending a night at one whenever possible.
The location of the La Rose is very nice as it is in the old part of Santa Rosa with restaurants, coffee houses and bars nearby (walking distance). A very nice change of pace from staying at a motel on the outskirts of town. On location alone we would rate it a 4.
Parking is funky, you need to park about a half block away behind a coffee house, but that is part of what you get when you stay in an urban setting, things are not always as convenient as you might desire.
The hotel itself was nothing special. The staff was OK, and the facility was old but appeared to be relatively well maintained. The rooms were quaint but again nothing special as compared to other historic hotels at which we have stayed.
Overall, it was nice and if you seek a place to stay in a lovely urban setting I would recommend you spend a night or two. There is a restaurant adjacent to the hotel which can be entered through the hotel lobby but we did not eat there so cannot comment.