Right through Grimm season two, I was thoroughly confused by Nick sleeping on the couch. They have quite a large house, so how is there room for only one (relatively small) bedroom upstairs?
This is a common TV Trope known as Exiled to the Couch. The man has to sleep on an uncomfortable couch instead of a bed. Even when circumstances should allow him to sleep in another available bed.
The real life house that was used in the Pilot which Nick and Juliette supposedly live in has 4 bedrooms.
There are actually 2 bedrooms and 2 bathrooms upstairs in Nick and Juliette's home. Juliette explained this to Kenneth in Season 4. Also, TRUBLE stayed in the second bedroom during her stay with Nick and Juliette in Seasons 3 & 4.
There are different options (why he sleeps on the coach)
- The Grimm wanted to sleep on the couch because a different bed would make it(problems with girlfriend) real.
- They don't have a bed in the other room(s) or the rooms are offices/ full with boxes.
There are two bedrooms and two baths in the first floor. Nothing more. The ground floor has kitchen with door, garage with door, "sitting room"/room with THE coach, PC (later) and perhaps more.
I want to thank the real house (4 bedrooms) and episode thing. I search for a room number.