A house is a representation of 'the self'. The rooms all represent different aspects of 'the self'....
the attic would represent the head, brain, or thoughts & ideas...the bedrooms would represent the private and/or sexual parts of the self...etc.
The furniture is representative of the attitudes, and habits we furnish our life with. Also notions about self & self image.

That you feel the house and it's decor is beautiful, suggests you feel good about yourself, and self-image and your abilities concerning 'the self'.

If you have had a recent disappointment or 'let-down', and you know it's not your fault, you may have a dream like this to reassure yourself.
Or if you have reached a goal, or finished a project you feel good about, this is your subconscious giving you a pat on the back.

You didn't mention who 'she' is ...the 'she' who left you the house. As though someone has passed away?
If known, 'she' could be a representation of a female figure in your life(mother, grandmother...etc) who left you the legacy of a positive attitude and happy outlook on life.
If the 'she' is unknown, it could be a representation of an unknown side of you...telling you to keep your chin up, and to look on the bright side of things.

Hope this gives you something to go on.
Cheers!