Learn Spanish (Latin America): Nuestra habitación es lindísima y comodísima. - Our room is extremely pretty and extremely comfortable.

When you add the -ísimo or -ísima suffix, the spoken stress always moves to the first i of the ending. Spanish requires a written accent there, so it always becomes í. Since a Spanish word can only have one stressed syllable and one written accent, cómoda loses its original accent mark when it becomes comodísima.

How exactly are lindísima and comodísima formed from linda and cómoda?

To add this suffix to an adjective that ends in a vowel, you must drop the original final vowel first. For example, linda drops the a to become lind-, and then you add -ísima to get lindísima.

Why do both of these adjectives end in -a (-ísima)?

Even with the intensified ending, adjectives still have to match the noun they describe in gender and number. Since habitación is a feminine, singular noun, both adjectives must use the feminine, singular -ísima ending instead of the masculine -ísimo.

Why does the sentence use es (from ser) instead of está (from estar)?