Hi Sebastian, how well do you know the plant? It looks to me (just by photos) it is a woody climber and if so it should be a 'scandent phanerophyte'. I'm not sure Raunkiaer had this subdivision or if it was a later addition by an other author.
Other possibilities are 'Vine' or 'Lianophyta', but from other authors, I think.
HI Sebastian, Dolichandra unguis-cati should be classified as a phanerophyte since it is a mechanically dependant woody plant which remains rooted in the soil.
As the plant is evergreen or may only lose some leaves in unfavorable conditions, it is clearly a phanerophyte. However, you might want to keep in mind that Raunkiaer's life forms are mainly created for (highly) seasonal (esp. temperate) floras. Tropical taxa often don't fit or differ extremely in form (cacti, trees, evergreen vines, epiphytes are all phanerophytes!) although being in the same Raunkiaer class. That's why most species are not put in one of those categories. There are other life form classifications though.