Unless you're there for the trash and towel and/or the full clean, I don't see the need to tip at all. For example, we just spent 3 nights at SSR followed by 3 nights at BCV and didn't receive either service, so for what would we be tipping? We made our own beds and kept the place clean ourselves - no maid service.
When we stayed at a Studio at SSR in August, we tipped $3 for the trash and towel service and $5 for the full clean.