Us 3 friends stayed a full month in the apartment doing remote work. The internet connection is excellent, the kitchen is fully equipped and basic amenities are all there. The location is also fantastic, right in Russafa, close to a big farmers market hall.
Carolyn was a very professional, helping and forthcoming host. We had issues with the AC's heating function not working during the cold winter days, and she quickly managed to get them replaced for us.
However, we were a bit underwhelmed with the rooms. One room has a wobbly, uncomfortable bed. The other has a shower and toilet next to the bed without any walls, which isn't a good or hygienic idea. The main bathroom is much smaller that it seems in the pictures and the water pressure is really low.
Also mind that Valencian apartments have thin walls. So you will hear the neighbours' loud steps and loud talking, which we don't factor in negatively here.
We'd recommend a stay in the apartment for 1-2 weeks.