How do layouts, popularity, and scenery work?

This game is pretty complex :-)

I understand the price, but then there is popularity and scenery. Popularity seems to indeed increase the popularity of the facility, but what does scenery do?

Plus there are the layouts effects which give you hearts that boost both popularity and price (but I had trouble determining the effects). Do they really boost the popularity and price, and does that count into pop./price shown on the first info tab?

What are the good layouts for baths and rooms?

Scenery increases the pop of the facility and the satisfaction a customer gets after using it. This is particularly important for guests. Layout effects occur when you place compatible facilities near one another or incompatible ones. They do not have any effect on popularity or price but they have an effect on the bonus, AKA the 2nd facility tab. Most people tend to focus on bath layouts; I have a pretty decent layout for a bath (F) which will give you, in terms of compatibility, 5 for YTH, 5 for ADLT and 4.5 for SNR but only 1 for GRP. As for the bath next to it, same bonuses bu only 4 for SNR.