29th July. We began our cruise aboard Sailin greece's Hera yacht. Upon entering the ship we were given a speech regarding expectations and basic itinery. Our guide was friendly and helpful. However we were given no instruction on safety procedure. Upon entering our room (near the engine room) we immediately noticed an odd smell. Due to the heat, we enquired about air-conditioning (as listed on the advertisement and information package. This emitted room temperature air. Later, we asked about the wi-fi, attempted to, but were unable to connect. Also listed on info pack. At this point we were understanding, as it is a yacht after all. The first night we slept in our room, but found the heat and fumes were intolerable. *a mixture of engine fumes and sewerage best describes the scent. To this point we began to get a little inconvenienced. The remainder of our trip was spent in and out of the room as quickly as possible as to avoid the fumes. And we slept on the deck sofas, where we witnessed crew members sleeping with guests and later abusing guests verbally. (This made our decision not to tip, an easy one - regardless of the advice by one host on day1 "to tip at least €20). Moving forward both my partner and I began to develop nausea, vomitting, headaches and a chesty cough. All of which are common symptoms of being exposed to the aforementioned fumes, however, yet to be determined as the exact cause by a medical professional. We were anchored outside of Paros on Day 2 as our Captain was unable to dock due to a lack of space at the Port. So that gave us one less day of exploration of wonderful Greece. For two days we were out of fresh water and were unable to use our showers, basins. Instead, a hose was connected to a partnering yacht and we hosed ourselves under cold water in full view of all guests (easy during the day, a little more challenging on a windy night). On the final day we were set to enter Santorini, but were unable to dock at the port and instead had to anchor along the south coast where dinghys were used to transfer people to land (land nowhere near the hub of Santorini). At this point a number of the guests, including myself, decided to pay for additional accomodation and stay in the town. We were transferred to shore, luggage being wet in the process and had to find transport (a 45 minute trip) into town. But boy were we glad to be off that boat - unfortunately we couldnt leave the chest pain and headaches on it. So far we wasted £600 pp on Sailingreece, an additional £90 on extra accomodation, not to mention the medical costs we may incur and the cancellation of sightseeing we were due to have post-sailingreece (as we are too ill to commit). I would urge anyone thinking about booking with this company to use ferries to travel and stay in hostels instead (to meet the great and wonderful people to share your travels with). I was fortunate to make new friends. Im sorry I didnt get to spend time with you, as I was too busy hugging the toilet and coughing up blood.