I stayed here for 10 days and it was great! It has entries on both Lambton Quay and The Terrace so it's very convenient to get to, but it's also high up enough that it's free of road noise. It's a nice cozy hotel room converted to a studio, with plenty of seating space and a kitchen.
Huup was extremely responsive and helped me adjust my reservation a few times.
I'd happily stay there again on my next visit to Wellington.