I have an end of terrace property that is split into two flats; both of which are rented out. The upstairs 2 bedroom flat is rented to a mother and 3 year old daughter. The downstairs 3 bedroom flat is rented to a family with a 17 year old, a 3 year old and a 5 month old baby. Unfortunately there is an infestation of bed bugs throughout the property and as a landlord I am stuck in the middle. The upstairs tenant wants the property treated as the daughter gets bitten frequently and the Nurse at her kindergarten is expressing concern. The downstairs tenants do not want the property treated as the babies Health Visitor says that the chemicals used in the treatment will not be good for the baby. The treatment company says that the whole property needs to be done in one go and it would be pointless to do just one part of the house at a time. Also that property needs to be vacated for just 2 hours and then all clothing, bedding, soft furnishings, carpets etc. need to be cleaned. The downstairs tenants rarely pay rent on time but they have redecorated the flat themselves (after consulting me on colour schemes). They are already what I would call long term tenants, having rented the upstairs flat for 2 years before moving downstairs nearly 18 months ago. The husband has been seriously ill earlier this year which has impacted his ability to work. The upstairs tenant is a model tenant, Always pays rent on time and intends to stay for at least another 8 years i.e until her daughter goes to secondary school. I should maybe point out that the area has Grammar Schools and she is keen that the daughter does not lose a place because of distance to the schools. She too has redecorated the flat herself (again after consultations about colours). It is likely that the infestation started with the current downstairs tenants when they rented the upstairs flat. It was when the upstairs tenant complained about the bed bugs that tyhe downstairs tenants said that they had also had them when they lived upstairs. I contacted the previous tenants of both flats and they confirmed that they did not have any such problems when they lived there. As a landlord, I do not want to have the reputation for having low standard properties in the area. The rental market is good. My last 4 voidages were all less than half a day. How do I balance the needs of both these tenancies and my own reputation? I know what options I have legally and how to implement them but I am interested in what the opinions of other landlords and advisors might be regarding the ethical issues and how to bring harmony between tenants.