Aye, as a guide for design decision making, prompts and reminders if you're starting out, this is a must. I make no apologies for this recommendation, which I started using in 1979. " A Pattern Language" by Chris Alexander, Ishikawa, Silverstein and colleagues is a must...throw away the plan books and use words to explore any sketches to assist in list making of wants, desires, must-haves, dislikes etc. There's no glossy fashion shots, many black and white photos to amplify the theme. The book is built around 253 themes (patterns), which are cross-referenced where appropriate ranging from town-design to placing your miss-matched armchairs...in a nut shell.
The book is difficult to describe in a few words, so I'll quote from the jacket..." At the core of the book is the idea that people should design for themselves: their own houses, streets, communities...Coming from the observation that most wonderful places of the world were not made by architects but by the people."
The book is still available (difficult to see it ever being withdrawn) and is available on abebooks for about £35 and as afree PDF download on a site called 'Diversity Univercity' for how long I know not!, but it's worth looking out for secondhand, because printing out 1200+ pages does not look fun. Of course, you could also support your local independent bookshop (Use it or lose it, and all that).