If the hot water system is electrical and you have previously had hot water, it is likely the hot water reserve has been depleted.
Please wait for the hot water system to generate hot water again. This could include waiting overnight if the hot water is ‘off-peak’. You can tell if the system is off-peak by looking at the fuse box. If there are two meters, it is likely to be off-peak hot water. If there is only one meter, there may be a problem with the hot water system.
If there is no hot water after waiting, find the fuse box and make sure the switch is on. A reset of the fuse switch may also help.
If the property has a gas hot water system, locate the chest-high gas bottles and perform a changeover. Mounted on the wall between the two bottles, you'll find a directional valve. The arrow direction will indicate the bottle currently in use and possibly empty. Close the empty gas bottle by turning the green valve clockwise. Now turn the directional valve to the other/full bottle. Open the second bottle by turning its green valve anti-clockwise.
Please then let the host know that you need to change over a gas bottle during your stay so that they can order a new one.