General strategy? Prepare rooms in blocks so you get the bonuses for filling each of the blocks of room colors. Use your starting staff cards as a way to give you a nudge toward whatever strategy you're going to employ this particular game. Find combos with other staff cards or guests as you go. In particular, the staff that let you take extra or bonus actions when you take a die of a particular rank are massively helpful, especially if you can get chains of bonuses going. Action efficiency is key.
I've not played it with just 2, but I'd imagine there's some significant strategy in doing the pass action and re-rolling to get what you need, especially when you're the 1st and 4th action taker.
There's some basics for you... anything more specific?
be wary of taking on too many black and white food orders at once. Avoid it unless you have a specific plan about getting extra black/white cubes that doesn't rely on the luck of the dice.
Take advantage of high powered actions (ie. when there's lots of dice of one number). It may not be the plan you had in mind, but if there's four 3's, prepare 4 rooms, same with any of the dice. Going with what the dice give you, and not getting stuck with multiple really expensive guests (ie guests that like white and black), are two things to think about to make your playing stronger!
Thank you all for your responses. It makes sense that action efficiency is key, since you're gonna have only 14 actions. So picking the right guests that allow you to save some of those actions seems like the way to go. The problem is that you need to pick also according to the color of rooms that you need and these will depend on the bonus cards. So many tough decisions! I love it! Also restraining from taking guests that require cake or coffee makes sense, since these are hard to come by.
What would be your priority for taking guests based on the bonuses they provide? Of course this will be also very dependent on the requirements of each one. This is my guess: 1.- Prepare rooms 2.- Flip room tiles 3.- Play staff cards 4.- Advance in Emperor track 5.- Free goods
And I don't know where to put the ones that give you money. I think the need of money depends a lot on the situation.