I use the green mop and really like them. They’re fairly flexible (for example, this week I asked if I could switch days and they got back to me within a few hours with a yes). They charge by the hour and are willing to work with you on price. For example, if you want to try to keep it in a certain amount, they’ll suggest things like cleaning certain rooms only every other time. I did this when I needed to go from once a month to every 2 weeks because I was recovering from surgery. I just had them clean the guest room every other time. As for price, it will depend on how large the row house is, how much they need to clean, and how often they come. I found them to be reasonable (cheaper than merry maids, for example).