Karen Costa Cleaning Service's

Karen Costa Cleaning Service's is a Marlborough house-cleaning business Karen Costa has run for about a decade, according to her Thumbtack profile — mostly residential jobs, with commercial cleaning also listed. Both review platforms currently show a clean sweep: Thumbtack's rating sits at 5.0 across 50 ratings, and Google shows 5 stars from its own smaller pool. What the written reviews describe, spanning 2021 through 2025, is unusually specific for a cleaning service. In a 2021 review, a customer said a deep clean left wood trim and wainscoting looking 'freshly painted,' and rehired the crew for a recurring biweekly clean; another 2021 review described Karen reviving 'the luster' of hardwood floors during a move-in cleaning. In 2023, a Google reviewer said a kitchen counter and sink 'felt like brand new' after a standard cleaning, at pricing they called reasonable, and another that year — a household with a large dog and two cats — called the team diligent about the extra mess pets create. As recently as 2025, a Marlborough apartment customer called the crew punctual and said they went above and beyond cleaning every corner. Nothing in the written record raises a flag — no complaint, no lapsed credential, no pattern of no-shows or damage — and house cleaning isn't a licensed trade in Massachusetts, so there's no registration to check. Anyone booking a first visit is looking at a small, repeat-business operation rather than a large crew, so it's worth confirming current availability and whether a job needs the standard or deep-clean tier — reviewers describe both.