What do I need to upgrade to max the stars on the first hotel?

For the first hotel you need:

Two Single Rooms

Upgrades: Lvl 5 bed, lvl 1 table, lvl 5 TV, lvl 4 climate control, lvl 5 toilet, lvl 7 shower, lvl 4 washbasin, level 4 additional items, level 3 decor

Six Double-Bed Rooms

Upgrades: lvl 5 bed, lvl 1 bedside table, lvl 1 bedside table, lvl 5 tv, lvl 4 climate control, lvl 5 toilet, lvl 7 shower, lvl 4 washbasin, lvl 4 additional items, level 3 decor – check all the six double-bed rooms

Restaurant

Upgrades: lvl 4(table, six tables), lvl 5 kitchen, lvl 6 food, lvl 6 beverages, lvl 5 decor

Housekeeping Room

Upgrades: lvl 3 cart, lvl 3 cleaning products, lvl 2 vacuum cleaner, lvl 2 vacuum cleaner

Bar

Upgrades: lvl 4(three tables), lvl 6 drink, lvl 4 decor, lvl 1 bar top

Frontdesk

Upgrades: lvl 3 front desk, lvl 4 decor, lvl 1 computer, lvl 1 computer, lvl 4 phone, lvl 4 phone

Electrical Room

Upgrades: lvl 3 power generator, level 3 battery, level 3 battery, level 3 battery

Parking

Upgrades: lvl 8 parking, lvl 4 barrier gate